Verify returned frames from media::VideoFrame::Wrap*() methods

cc/layers/video_layer_impl_unittest.cc

Index: cc/layers/video_layer_impl_unittest.cc
diff --git a/cc/layers/video_layer_impl_unittest.cc b/cc/layers/video_layer_impl_unittest.cc
index b5f1c0fdc2d3e413e1b9c7b05a4c28556c998146..355837601ac7a37124ad61cf9dd4cba40fbce0c4 100644
--- a/cc/layers/video_layer_impl_unittest.cc
+++ b/cc/layers/video_layer_impl_unittest.cc
@@ -343,6 +343,7 @@ TEST(VideoLayerImplTest, NativeYUVFrameGeneratesYUVQuad) {
           mailbox_holder, mailbox_holder, mailbox_holder,
           base::Bind(EmptyCallback), gfx::Size(10, 10), gfx::Rect(10, 10),
           gfx::Size(10, 10), base::TimeDelta());
+  ASSERT_TRUE(video_frame);
   video_frame->metadata()->SetBoolean(media::VideoFrameMetadata::ALLOW_OVERLAY,
                                       true);
   FakeVideoFrameProvider provider;