Support dispatchNullEvent virtual method

Added for AChoreographer in I66abc2e28e60f06987ce3a54be294c94b77524fc

Bug: 154874011
Bug: 158680912
Bug: 161406626
Test: builds
Change-Id: Iac1f8eafc4d25a5a7c8b6d8eed3f6686705fc2fb
Merged-In: Iac1f8eafc4d25a5a7c8b6d8eed3f6686705fc2fb
(cherry picked from commit 1315f1105e22066579f009facf60bc538d21d9fd)
diff --git a/core/jni/android_view_DisplayEventReceiver.cpp b/core/jni/android_view_DisplayEventReceiver.cpp
index 7daefd3..26e862f 100644
--- a/core/jni/android_view_DisplayEventReceiver.cpp
+++ b/core/jni/android_view_DisplayEventReceiver.cpp
@@ -63,6 +63,7 @@
     void dispatchHotplug(nsecs_t timestamp, PhysicalDisplayId displayId, bool connected) override;
     void dispatchConfigChanged(nsecs_t timestamp, PhysicalDisplayId displayId,
                                int32_t configId, nsecs_t vsyncPeriod) override;
+    void dispatchNullEvent(nsecs_t timestamp, PhysicalDisplayId displayId) override {}
 };