cc: Fix propagation of presentation-time request.

Make sure the request for presentation-time gets propagated correcly
from the pending-tree to the active-tree, so that if presentation-time
is requested on LayerTreeHost, it reaches all the way through to the
CompositorFrame.

BUG=811961

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I4745a1b49ed5e404610c6f491e7f98d541b178be
Reviewed-on: https://chromium-review.googlesource.com/1056360Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558539}

cc/trees/layer_tree_host_unittest.cc

@@ -7512,6 +7512,25 @@ class LayerTreeHostTestPaintedDeviceScaleFactor : public LayerTreeHostTest {
 };
 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestPaintedDeviceScaleFactor);
 
+// Makes sure that presentation-time requests are correctly propagated to the
+// frame's metadata.
+class LayerTreeHostTestPresentationTimeRequest : public LayerTreeHostTest {
+ protected:
+  void BeginTest() override {
+    layer_tree_host()->RequestPresentationTimeForNextFrame(base::DoNothing());
+    PostSetNeedsCommitToMainThread();
+  }
+
+  void DisplayReceivedCompositorFrameOnThread(
+      const viz::CompositorFrame& frame) override {
+    EXPECT_NE(0u, frame.metadata.presentation_token);
+    EndTest();
+  }
+
+  void AfterTest() override {}
+};
+SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestPresentationTimeRequest);
+
 // Makes sure that viz::LocalSurfaceId is propagated to the LayerTreeFrameSink.
 class LayerTreeHostTestLocalSurfaceId : public LayerTreeHostTest {
  protected:

cc/trees/layer_tree_impl.cc

@@ -468,6 +468,7 @@ void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
   target_tree->elastic_overscroll()->PushPendingToActive();
 
   target_tree->set_content_source_id(content_source_id());
+  target_tree->set_request_presentation_time(request_presentation_time());
 
   if (TakeNewLocalSurfaceIdRequest())
     target_tree->RequestNewLocalSurfaceId();