cc/surfaces/surface_unittest.cc - platform/external/chromium_org - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "cc/output/compositor_frame.h"
 #include "cc/output/delegated_frame_data.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_client.h"
 #include "cc/surfaces/surface_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size.h"

 namespace cc {
 namespace {

 TEST(SurfaceTest, SurfaceLifetime) {
   SurfaceManager manager;

   SurfaceId surface_id;
   {
     Surface surface(&manager, NULL, gfx::Size(5, 5));
     surface_id = surface.surface_id();
     EXPECT_TRUE(!surface_id.is_null());
     EXPECT_EQ(&surface, manager.GetSurfaceForId(surface_id));
   }

   EXPECT_EQ(NULL, manager.GetSurfaceForId(surface_id));
 }

 class TestSurfaceClient : public SurfaceClient {
  public:
   TestSurfaceClient() {}
   virtual ~TestSurfaceClient() {}

   virtual void ReturnResources(
       const ReturnedResourceArray& resources) OVERRIDE {
     returned_resources_ = resources;
   }

   const ReturnedResourceArray& returned_resources() const {
     return returned_resources_;
   }

   void clear_returned_resources() { returned_resources_.clear(); }

  private:
   ReturnedResourceArray returned_resources_;

   DISALLOW_COPY_AND_ASSIGN(TestSurfaceClient);
 };

 void SubmitFrameWithResources(ResourceProvider::ResourceId* resource_ids,
                               size_t num_resource_ids,
                               Surface* surface) {
   scoped_ptr<DelegatedFrameData> frame_data(new DelegatedFrameData);
   for (size_t i = 0u; i < num_resource_ids; ++i) {
     TransferableResource resource;
     resource.id = resource_ids[i];
     resource.mailbox_holder.texture_target = GL_TEXTURE_2D;
     frame_data->resource_list.push_back(resource);
   }
   scoped_ptr<CompositorFrame> frame(new CompositorFrame);
   frame->delegated_frame_data = frame_data.Pass();
   surface->QueueFrame(frame.Pass());
 }

 void CheckReturnedResourcesMatchExpected(
     ResourceProvider::ResourceId* expected_returned_ids,
     int* expected_returned_counts,
     size_t expected_resources,
     const ReturnedResourceArray& actual_resources) {
   ASSERT_EQ(expected_resources, actual_resources.size());
   for (size_t i = 0; i < expected_resources; ++i) {
     ReturnedResource resource = actual_resources[i];
     EXPECT_EQ(expected_returned_ids[i], resource.id);
     EXPECT_EQ(expected_returned_counts[i], resource.count);
   }
 }

 void UnrefResources(ResourceProvider::ResourceId* ids_to_unref,
                     int* counts_to_unref,
                     size_t num_ids_to_unref,
                     Surface* surface) {
   ReturnedResourceArray unref_array;
   for (size_t i = 0; i < num_ids_to_unref; ++i) {
     ReturnedResource resource;
     resource.id = ids_to_unref[i];
     resource.count = counts_to_unref[i];
     unref_array.push_back(resource);
   }
   surface->UnrefResources(unref_array);
 }

 // Tests submitting a frame with resources followed by one with no resources
 // with no resource provider action in between.
 TEST(SurfaceTest, ResourceLifetimeSimple) {
   SurfaceManager manager;
   TestSurfaceClient client;
   Surface surface(&manager, &client, gfx::Size(5, 5));

   ResourceProvider::ResourceId first_frame_ids[] = {1, 2, 3};
   SubmitFrameWithResources(
       first_frame_ids, arraysize(first_frame_ids), &surface);

   // All of the resources submitted in the first frame are still in use at this
   // time by virtue of being in the pending frame, so none can be returned to
   // the client yet.
   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());
   client.clear_returned_resources();

   // The second frame references no resources and thus should make all resources
   // available to be returned.
   SubmitFrameWithResources(NULL, 0, &surface);

   surface.ReturnUnusedResourcesToClient();
   ResourceProvider::ResourceId expected_returned_ids[] = {1, 2, 3};
   int expected_returned_counts[] = {1, 1, 1};
   CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                       expected_returned_counts,
                                       arraysize(expected_returned_counts),
                                       client.returned_resources());
 }

 // Tests submitting a frame with resources followed by one with no resources
 // with the resource provider holding everything alive.
 TEST(SurfaceTest, ResourceLifetimeSimpleWithProviderHoldingAlive) {
   SurfaceManager manager;
   TestSurfaceClient client;
   Surface surface(&manager, &client, gfx::Size(5, 5));

   ResourceProvider::ResourceId first_frame_ids[] = {1, 2, 3};
   SubmitFrameWithResources(
       first_frame_ids, arraysize(first_frame_ids), &surface);

   // All of the resources submitted in the first frame are still in use at this
   // time by virtue of being in the pending frame, so none can be returned to
   // the client yet.
   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());
   client.clear_returned_resources();

   // Hold on to everything.
   surface.RefCurrentFrameResources();

   // The second frame references no resources and thus should make all resources
   // available to be returned as soon as the resource provider releases them.
   SubmitFrameWithResources(NULL, 0, &surface);

   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());
   client.clear_returned_resources();

   int release_counts[] = {1, 1, 1};
   UnrefResources(
       first_frame_ids, release_counts, arraysize(first_frame_ids), &surface);

   surface.ReturnUnusedResourcesToClient();
   ResourceProvider::ResourceId expected_returned_ids[] = {1, 2, 3};
   int expected_returned_counts[] = {1, 1, 1};
   CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                       expected_returned_counts,
                                       arraysize(expected_returned_counts),
                                       client.returned_resources());
 }

 // Tests referencing a resource, unref'ing it to zero, then using it again
 // before returning it to the client.
 TEST(SurfaceTest, ResourceReusedBeforeReturn) {
   SurfaceManager manager;
   TestSurfaceClient client;
   Surface surface(&manager, &client, gfx::Size(5, 5));

   ResourceProvider::ResourceId first_frame_ids[] = {7};
   SubmitFrameWithResources(
       first_frame_ids, arraysize(first_frame_ids), &surface);

   // This removes all references to resource id 7.
   SubmitFrameWithResources(NULL, 0, &surface);

   // This references id 7 again.
   SubmitFrameWithResources(
       first_frame_ids, arraysize(first_frame_ids), &surface);

   // This removes it again.
   SubmitFrameWithResources(NULL, 0, &surface);

   // Now it should be returned.
   surface.ReturnUnusedResourcesToClient();

   // We don't care how many entries are in the returned array for 7, so long as
   // the total returned count matches the submitted count.
   const ReturnedResourceArray& returned = client.returned_resources();
   size_t return_count = 0;
   for (size_t i = 0; i < returned.size(); ++i) {
     EXPECT_EQ(7u, returned[i].id);
     return_count += returned[i].count;
   }
   EXPECT_EQ(2u, return_count);
 }

 // Tests having resources referenced multiple times, as if referenced by
 // multiple providers.
 TEST(SurfaceTest, ResourceRefMultipleTimes) {
   SurfaceManager manager;
   TestSurfaceClient client;
   Surface surface(&manager, &client, gfx::Size(5, 5));

   ResourceProvider::ResourceId first_frame_ids[] = {3, 4};
   SubmitFrameWithResources(
       first_frame_ids, arraysize(first_frame_ids), &surface);

   // Ref resources from the first frame twice.
   surface.RefCurrentFrameResources();
   surface.RefCurrentFrameResources();

   ResourceProvider::ResourceId second_frame_ids[] = {4, 5};
   SubmitFrameWithResources(
       second_frame_ids, arraysize(second_frame_ids), &surface);

   // Ref resources from the second frame 3 times.
   surface.RefCurrentFrameResources();
   surface.RefCurrentFrameResources();
   surface.RefCurrentFrameResources();

   // Submit a frame with no resources to remove all current frame refs from
   // submitted resources.
   SubmitFrameWithResources(NULL, 0, &surface);

   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());
   client.clear_returned_resources();

   // Expected current refs:
   //  3 -> 2
   //  4 -> 2 + 3 = 5
   //  5 -> 3
   {
     SCOPED_TRACE("unref all 3");
     ResourceProvider::ResourceId ids_to_unref[] = {3, 4, 5};
     int counts[] = {1, 1, 1};
     UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

     surface.ReturnUnusedResourcesToClient();
     EXPECT_EQ(0u, client.returned_resources().size());
     client.clear_returned_resources();

     UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

     surface.ReturnUnusedResourcesToClient();
     ResourceProvider::ResourceId expected_returned_ids[] = {3};
     int expected_returned_counts[] = {1};
     CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                         expected_returned_counts,
                                         arraysize(expected_returned_counts),
                                         client.returned_resources());
   }

   // Expected refs remaining:
   //  4 -> 3
   //  5 -> 1
   {
     SCOPED_TRACE("unref 4 and 5");
     ResourceProvider::ResourceId ids_to_unref[] = {4, 5};
     int counts[] = {1, 1};
     UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

     surface.ReturnUnusedResourcesToClient();
     ResourceProvider::ResourceId expected_returned_ids[] = {5};
     int expected_returned_counts[] = {1};
     CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                         expected_returned_counts,
                                         arraysize(expected_returned_counts),
                                         client.returned_resources());
   }

   // Now, just 2 refs remaining on resource 4. Unref both at once and make sure
   // the returned count is correct.
   {
     SCOPED_TRACE("unref only 4");
     ResourceProvider::ResourceId ids_to_unref[] = {4};
     int counts[] = {2};
     UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

     surface.ReturnUnusedResourcesToClient();
     ResourceProvider::ResourceId expected_returned_ids[] = {4};
     int expected_returned_counts[] = {2};
     CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                         expected_returned_counts,
                                         arraysize(expected_returned_counts),
                                         client.returned_resources());
   }
 }

 TEST(SurfaceTest, ResourceLifetime) {
   SurfaceManager manager;
   TestSurfaceClient client;
   Surface surface(&manager, &client, gfx::Size(5, 5));

   ResourceProvider::ResourceId first_frame_ids[] = {1, 2, 3};
   SubmitFrameWithResources(
       first_frame_ids, arraysize(first_frame_ids), &surface);

   // All of the resources submitted in the first frame are still in use at this
   // time by virtue of being in the pending frame, so none can be returned to
   // the client yet.
   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());
   client.clear_returned_resources();

   // The second frame references some of the same resources, but some different
   // ones. We expect to receive back resource 1 with a count of 1 since it was
   // only referenced by the first frame.
   ResourceProvider::ResourceId second_frame_ids[] = {2, 3, 4};
   SubmitFrameWithResources(
       second_frame_ids, arraysize(second_frame_ids), &surface);

   surface.ReturnUnusedResourcesToClient();
   {
     SCOPED_TRACE("second frame");
     ResourceProvider::ResourceId expected_returned_ids[] = {1};
     int expected_returned_counts[] = {1};
     CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                         expected_returned_counts,
                                         arraysize(expected_returned_counts),
                                         client.returned_resources());
   }

   // The third frame references a disjoint set of resources, so we expect to
   // receive back all resources from the first and second frames. Resource IDs 2
   // and 3 will have counts of 2, since they were used in both frames, and
   // resource ID 4 will have a count of 1.
   ResourceProvider::ResourceId third_frame_ids[] = {10, 11, 12, 13};
   SubmitFrameWithResources(
       third_frame_ids, arraysize(third_frame_ids), &surface);

   surface.ReturnUnusedResourcesToClient();
   {
     SCOPED_TRACE("third frame");
     ResourceProvider::ResourceId expected_returned_ids[] = {2, 3, 4};
     int expected_returned_counts[] = {2, 2, 1};
     CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                         expected_returned_counts,
                                         arraysize(expected_returned_counts),
                                         client.returned_resources());
   }

   // Simulate a ResourceProvider taking a ref on all of the resources.
   surface.RefCurrentFrameResources();

   ResourceProvider::ResourceId fourth_frame_ids[] = {12, 13};
   SubmitFrameWithResources(
       fourth_frame_ids, arraysize(fourth_frame_ids), &surface);

   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());

   surface.RefCurrentFrameResources();

   // All resources are still being used by the external reference, so none can
   // be returned to the client.
   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());

   // Release resources associated with the first RefCurrentFrameResources() call
   // first.
   {
     ResourceProvider::ResourceId ids_to_unref[] = {10, 11, 12, 13};
     int counts[] = {1, 1, 1, 1};
     UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);
   }

   surface.ReturnUnusedResourcesToClient();
   {
     SCOPED_TRACE("fourth frame, first unref");
     ResourceProvider::ResourceId expected_returned_ids[] = {10, 11};
     int expected_returned_counts[] = {1, 1};
     CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                         expected_returned_counts,
                                         arraysize(expected_returned_counts),
                                         client.returned_resources());
   }

   {
     ResourceProvider::ResourceId ids_to_unref[] = {12, 13};
     int counts[] = {1, 1};
     UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);
   }

   // Resources 12 and 13 are still in use by the current frame, so they
   // shouldn't be available to be returned.
   surface.ReturnUnusedResourcesToClient();
   EXPECT_EQ(0u, client.returned_resources().size());

   // If we submit an empty frame, however, they should become available.
   SubmitFrameWithResources(NULL, 0u, &surface);

   surface.ReturnUnusedResourcesToClient();
   {
     SCOPED_TRACE("fourth frame, second unref");
     ResourceProvider::ResourceId expected_returned_ids[] = {12, 13};
     int expected_returned_counts[] = {2, 2};
     CheckReturnedResourcesMatchExpected(expected_returned_ids,
                                         expected_returned_counts,
                                         arraysize(expected_returned_counts),
                                         client.returned_resources());
   }
 }

 }  // namespace
 }  // namespace cc
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "cc/output/compositor_frame.h"
	#include "cc/output/delegated_frame_data.h"
	#include "cc/surfaces/surface.h"
	#include "cc/surfaces/surface_client.h"
	#include "cc/surfaces/surface_manager.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "ui/gfx/size.h"

	namespace cc {
	namespace {

	TEST(SurfaceTest, SurfaceLifetime) {
	SurfaceManager manager;

	SurfaceId surface_id;
	{
	Surface surface(&manager, NULL, gfx::Size(5, 5));
	surface_id = surface.surface_id();
	EXPECT_TRUE(!surface_id.is_null());
	EXPECT_EQ(&surface, manager.GetSurfaceForId(surface_id));
	}

	EXPECT_EQ(NULL, manager.GetSurfaceForId(surface_id));
	}

	class TestSurfaceClient : public SurfaceClient {
	public:
	TestSurfaceClient() {}
	virtual ~TestSurfaceClient() {}

	virtual void ReturnResources(
	const ReturnedResourceArray& resources) OVERRIDE {
	returned_resources_ = resources;
	}

	const ReturnedResourceArray& returned_resources() const {
	return returned_resources_;
	}

	void clear_returned_resources() { returned_resources_.clear(); }

	private:
	ReturnedResourceArray returned_resources_;

	DISALLOW_COPY_AND_ASSIGN(TestSurfaceClient);
	};

	void SubmitFrameWithResources(ResourceProvider::ResourceId* resource_ids,
	size_t num_resource_ids,
	Surface* surface) {
	scoped_ptr<DelegatedFrameData> frame_data(new DelegatedFrameData);
	for (size_t i = 0u; i < num_resource_ids; ++i) {
	TransferableResource resource;
	resource.id = resource_ids[i];
	resource.mailbox_holder.texture_target = GL_TEXTURE_2D;
	frame_data->resource_list.push_back(resource);
	}
	scoped_ptr<CompositorFrame> frame(new CompositorFrame);
	frame->delegated_frame_data = frame_data.Pass();
	surface->QueueFrame(frame.Pass());
	}

	void CheckReturnedResourcesMatchExpected(
	ResourceProvider::ResourceId* expected_returned_ids,
	int* expected_returned_counts,
	size_t expected_resources,
	const ReturnedResourceArray& actual_resources) {
	ASSERT_EQ(expected_resources, actual_resources.size());
	for (size_t i = 0; i < expected_resources; ++i) {
	ReturnedResource resource = actual_resources[i];
	EXPECT_EQ(expected_returned_ids[i], resource.id);
	EXPECT_EQ(expected_returned_counts[i], resource.count);
	}
	}

	void UnrefResources(ResourceProvider::ResourceId* ids_to_unref,
	int* counts_to_unref,
	size_t num_ids_to_unref,
	Surface* surface) {
	ReturnedResourceArray unref_array;
	for (size_t i = 0; i < num_ids_to_unref; ++i) {
	ReturnedResource resource;
	resource.id = ids_to_unref[i];
	resource.count = counts_to_unref[i];
	unref_array.push_back(resource);
	}
	surface->UnrefResources(unref_array);
	}

	// Tests submitting a frame with resources followed by one with no resources
	// with no resource provider action in between.
	TEST(SurfaceTest, ResourceLifetimeSimple) {
	SurfaceManager manager;
	TestSurfaceClient client;
	Surface surface(&manager, &client, gfx::Size(5, 5));

	ResourceProvider::ResourceId first_frame_ids[] = {1, 2, 3};
	SubmitFrameWithResources(
	first_frame_ids, arraysize(first_frame_ids), &surface);

	// All of the resources submitted in the first frame are still in use at this
	// time by virtue of being in the pending frame, so none can be returned to
	// the client yet.
	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());
	client.clear_returned_resources();

	// The second frame references no resources and thus should make all resources
	// available to be returned.
	SubmitFrameWithResources(NULL, 0, &surface);

	surface.ReturnUnusedResourcesToClient();
	ResourceProvider::ResourceId expected_returned_ids[] = {1, 2, 3};
	int expected_returned_counts[] = {1, 1, 1};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}

	// Tests submitting a frame with resources followed by one with no resources
	// with the resource provider holding everything alive.
	TEST(SurfaceTest, ResourceLifetimeSimpleWithProviderHoldingAlive) {
	SurfaceManager manager;
	TestSurfaceClient client;
	Surface surface(&manager, &client, gfx::Size(5, 5));

	ResourceProvider::ResourceId first_frame_ids[] = {1, 2, 3};
	SubmitFrameWithResources(
	first_frame_ids, arraysize(first_frame_ids), &surface);

	// All of the resources submitted in the first frame are still in use at this
	// time by virtue of being in the pending frame, so none can be returned to
	// the client yet.
	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());
	client.clear_returned_resources();

	// Hold on to everything.
	surface.RefCurrentFrameResources();

	// The second frame references no resources and thus should make all resources
	// available to be returned as soon as the resource provider releases them.
	SubmitFrameWithResources(NULL, 0, &surface);

	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());
	client.clear_returned_resources();

	int release_counts[] = {1, 1, 1};
	UnrefResources(
	first_frame_ids, release_counts, arraysize(first_frame_ids), &surface);

	surface.ReturnUnusedResourcesToClient();
	ResourceProvider::ResourceId expected_returned_ids[] = {1, 2, 3};
	int expected_returned_counts[] = {1, 1, 1};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}

	// Tests referencing a resource, unref'ing it to zero, then using it again
	// before returning it to the client.
	TEST(SurfaceTest, ResourceReusedBeforeReturn) {
	SurfaceManager manager;
	TestSurfaceClient client;
	Surface surface(&manager, &client, gfx::Size(5, 5));

	ResourceProvider::ResourceId first_frame_ids[] = {7};
	SubmitFrameWithResources(
	first_frame_ids, arraysize(first_frame_ids), &surface);

	// This removes all references to resource id 7.
	SubmitFrameWithResources(NULL, 0, &surface);

	// This references id 7 again.
	SubmitFrameWithResources(
	first_frame_ids, arraysize(first_frame_ids), &surface);

	// This removes it again.
	SubmitFrameWithResources(NULL, 0, &surface);

	// Now it should be returned.
	surface.ReturnUnusedResourcesToClient();

	// We don't care how many entries are in the returned array for 7, so long as
	// the total returned count matches the submitted count.
	const ReturnedResourceArray& returned = client.returned_resources();
	size_t return_count = 0;
	for (size_t i = 0; i < returned.size(); ++i) {
	EXPECT_EQ(7u, returned[i].id);
	return_count += returned[i].count;
	}
	EXPECT_EQ(2u, return_count);
	}

	// Tests having resources referenced multiple times, as if referenced by
	// multiple providers.
	TEST(SurfaceTest, ResourceRefMultipleTimes) {
	SurfaceManager manager;
	TestSurfaceClient client;
	Surface surface(&manager, &client, gfx::Size(5, 5));

	ResourceProvider::ResourceId first_frame_ids[] = {3, 4};
	SubmitFrameWithResources(
	first_frame_ids, arraysize(first_frame_ids), &surface);

	// Ref resources from the first frame twice.
	surface.RefCurrentFrameResources();
	surface.RefCurrentFrameResources();

	ResourceProvider::ResourceId second_frame_ids[] = {4, 5};
	SubmitFrameWithResources(
	second_frame_ids, arraysize(second_frame_ids), &surface);

	// Ref resources from the second frame 3 times.
	surface.RefCurrentFrameResources();
	surface.RefCurrentFrameResources();
	surface.RefCurrentFrameResources();

	// Submit a frame with no resources to remove all current frame refs from
	// submitted resources.
	SubmitFrameWithResources(NULL, 0, &surface);

	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());
	client.clear_returned_resources();

	// Expected current refs:
	// 3 -> 2
	// 4 -> 2 + 3 = 5
	// 5 -> 3
	{
	SCOPED_TRACE("unref all 3");
	ResourceProvider::ResourceId ids_to_unref[] = {3, 4, 5};
	int counts[] = {1, 1, 1};
	UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());
	client.clear_returned_resources();

	UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

	surface.ReturnUnusedResourcesToClient();
	ResourceProvider::ResourceId expected_returned_ids[] = {3};
	int expected_returned_counts[] = {1};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}

	// Expected refs remaining:
	// 4 -> 3
	// 5 -> 1
	{
	SCOPED_TRACE("unref 4 and 5");
	ResourceProvider::ResourceId ids_to_unref[] = {4, 5};
	int counts[] = {1, 1};
	UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

	surface.ReturnUnusedResourcesToClient();
	ResourceProvider::ResourceId expected_returned_ids[] = {5};
	int expected_returned_counts[] = {1};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}

	// Now, just 2 refs remaining on resource 4. Unref both at once and make sure
	// the returned count is correct.
	{
	SCOPED_TRACE("unref only 4");
	ResourceProvider::ResourceId ids_to_unref[] = {4};
	int counts[] = {2};
	UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);

	surface.ReturnUnusedResourcesToClient();
	ResourceProvider::ResourceId expected_returned_ids[] = {4};
	int expected_returned_counts[] = {2};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}
	}

	TEST(SurfaceTest, ResourceLifetime) {
	SurfaceManager manager;
	TestSurfaceClient client;
	Surface surface(&manager, &client, gfx::Size(5, 5));

	ResourceProvider::ResourceId first_frame_ids[] = {1, 2, 3};
	SubmitFrameWithResources(
	first_frame_ids, arraysize(first_frame_ids), &surface);

	// All of the resources submitted in the first frame are still in use at this
	// time by virtue of being in the pending frame, so none can be returned to
	// the client yet.
	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());
	client.clear_returned_resources();

	// The second frame references some of the same resources, but some different
	// ones. We expect to receive back resource 1 with a count of 1 since it was
	// only referenced by the first frame.
	ResourceProvider::ResourceId second_frame_ids[] = {2, 3, 4};
	SubmitFrameWithResources(
	second_frame_ids, arraysize(second_frame_ids), &surface);

	surface.ReturnUnusedResourcesToClient();
	{
	SCOPED_TRACE("second frame");
	ResourceProvider::ResourceId expected_returned_ids[] = {1};
	int expected_returned_counts[] = {1};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}

	// The third frame references a disjoint set of resources, so we expect to
	// receive back all resources from the first and second frames. Resource IDs 2
	// and 3 will have counts of 2, since they were used in both frames, and
	// resource ID 4 will have a count of 1.
	ResourceProvider::ResourceId third_frame_ids[] = {10, 11, 12, 13};
	SubmitFrameWithResources(
	third_frame_ids, arraysize(third_frame_ids), &surface);

	surface.ReturnUnusedResourcesToClient();
	{
	SCOPED_TRACE("third frame");
	ResourceProvider::ResourceId expected_returned_ids[] = {2, 3, 4};
	int expected_returned_counts[] = {2, 2, 1};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}

	// Simulate a ResourceProvider taking a ref on all of the resources.
	surface.RefCurrentFrameResources();

	ResourceProvider::ResourceId fourth_frame_ids[] = {12, 13};
	SubmitFrameWithResources(
	fourth_frame_ids, arraysize(fourth_frame_ids), &surface);

	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());

	surface.RefCurrentFrameResources();

	// All resources are still being used by the external reference, so none can
	// be returned to the client.
	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());

	// Release resources associated with the first RefCurrentFrameResources() call
	// first.
	{
	ResourceProvider::ResourceId ids_to_unref[] = {10, 11, 12, 13};
	int counts[] = {1, 1, 1, 1};
	UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);
	}

	surface.ReturnUnusedResourcesToClient();
	{
	SCOPED_TRACE("fourth frame, first unref");
	ResourceProvider::ResourceId expected_returned_ids[] = {10, 11};
	int expected_returned_counts[] = {1, 1};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}

	{
	ResourceProvider::ResourceId ids_to_unref[] = {12, 13};
	int counts[] = {1, 1};
	UnrefResources(ids_to_unref, counts, arraysize(ids_to_unref), &surface);
	}

	// Resources 12 and 13 are still in use by the current frame, so they
	// shouldn't be available to be returned.
	surface.ReturnUnusedResourcesToClient();
	EXPECT_EQ(0u, client.returned_resources().size());

	// If we submit an empty frame, however, they should become available.
	SubmitFrameWithResources(NULL, 0u, &surface);

	surface.ReturnUnusedResourcesToClient();
	{
	SCOPED_TRACE("fourth frame, second unref");
	ResourceProvider::ResourceId expected_returned_ids[] = {12, 13};
	int expected_returned_counts[] = {2, 2};
	CheckReturnedResourcesMatchExpected(expected_returned_ids,
	expected_returned_counts,
	arraysize(expected_returned_counts),
	client.returned_resources());
	}
	}

	} // namespace
	} // namespace cc