Avoid creating sync token when only change is new hardware video frame.

media/renderers/mock_gpu_video_accelerator_factories.h

Index: media/renderers/mock_gpu_video_accelerator_factories.h
diff --git a/media/renderers/mock_gpu_video_accelerator_factories.h b/media/renderers/mock_gpu_video_accelerator_factories.h
index 3db81dc7186fed2590890125f54e5acf50494601..3337bca5b64eace1eef2d5d9b01260aa2930f590 100644
--- a/media/renderers/mock_gpu_video_accelerator_factories.h
+++ b/media/renderers/mock_gpu_video_accelerator_factories.h
@@ -42,6 +42,7 @@ class MockGpuVideoAcceleratorFactories : public GpuVideoAcceleratorFactories {
                     std::vector<gpu::Mailbox>* texture_mailboxes,
                     uint32_t texture_target));
   MOCK_METHOD1(DeleteTexture, void(uint32_t texture_id));
+  MOCK_METHOD0(CreateSyncToken, gpu::SyncToken());
   MOCK_METHOD1(WaitSyncToken, void(const gpu::SyncToken& sync_token));
   MOCK_METHOD0(GetTaskRunner, scoped_refptr<base::SingleThreadTaskRunner>());
   MOCK_METHOD0(GetVideoDecodeAcceleratorCapabilities,