cc: Various code safety improvements in video compositing code.

cc/trees/layer_tree_host_unittest_video.cc

Index: cc/trees/layer_tree_host_unittest_video.cc
diff --git a/cc/trees/layer_tree_host_unittest_video.cc b/cc/trees/layer_tree_host_unittest_video.cc
index ffeda727fe3f30fc38280a8f78b161fcb6918ceb..4952ea7204aee0569840da9930265ef2ce6a7a6a 100644
--- a/cc/trees/layer_tree_host_unittest_video.cc
+++ b/cc/trees/layer_tree_host_unittest_video.cc
@@ -77,7 +77,7 @@ class LayerTreeHostVideoTestSetNeedsDisplay
     EXPECT_EQ(media::VIDEO_ROTATION_90, video->video_rotation());
 
     if (num_draws_ == 0)
-      video->SetNeedsRedraw();
+      video_frame_provider_.SendDidReceiveFrame();
 
     ++num_draws_;
   }