Mark failing presubmit tests as flaky

Bug: 170502188
Bug: 169976309
Test: Build CTS
Change-Id: I4368c2618c320430713e2b0bb5667487cde895b5
diff --git a/tests/framework/base/windowmanager/src/android/server/wm/ActivityVisibilityTests.java b/tests/framework/base/windowmanager/src/android/server/wm/ActivityVisibilityTests.java
index 6e4d1c1..7c4707c 100644
--- a/tests/framework/base/windowmanager/src/android/server/wm/ActivityVisibilityTests.java
+++ b/tests/framework/base/windowmanager/src/android/server/wm/ActivityVisibilityTests.java
@@ -73,6 +73,8 @@
 import android.server.wm.CommandSession.ActivitySessionClient;
 import android.server.wm.app.Components;
 
+import androidx.test.filters.FlakyTest;
+
 import org.junit.Rule;
 import org.junit.Test;
 
@@ -87,6 +89,7 @@
     @Rule
     public final DisableScreenDozeRule mDisableScreenDozeRule = new DisableScreenDozeRule();
 
+    @FlakyTest(bugId = 170502188)
     @Test
     public void testTranslucentActivityOnTopOfPinnedStack() throws Exception {
         if (!supportsPip()) {
diff --git a/tests/framework/base/windowmanager/src/android/server/wm/AssistantStackTests.java b/tests/framework/base/windowmanager/src/android/server/wm/AssistantStackTests.java
index 2e3e414..27925f5 100644
--- a/tests/framework/base/windowmanager/src/android/server/wm/AssistantStackTests.java
+++ b/tests/framework/base/windowmanager/src/android/server/wm/AssistantStackTests.java
@@ -64,6 +64,7 @@
  * Build/Install/Run:
  *     atest CtsWindowManagerDeviceTestCases:AssistantStackTests
  */
+@FlakyTest(bugId = 169976309)
 @Presubmit
 public class AssistantStackTests extends ActivityManagerTestBase {
 
diff --git a/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java b/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java
index e43352b..c710ea8 100644
--- a/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java
+++ b/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java
@@ -538,6 +538,7 @@
                 (float) MAX_ASPECT_RATIO_NUMERATOR / MAX_ASPECT_RATIO_DENOMINATOR);
     }
 
+    @FlakyTest(bugId = 170502188)
     @Test
     public void testAutoEnterPictureInPictureOverPip() throws Exception {
         // Launch another PIP activity
@@ -558,6 +559,7 @@
         assertEquals(getActivityName(ALWAYS_FOCUSABLE_PIP_ACTIVITY), pinnedStack.mRealActivity);
     }
 
+    @FlakyTest(bugId = 170502188)
     @Test
     public void testDismissPipWhenLaunchNewOne() throws Exception {
         // Launch another PIP activity