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

media/renderers/gpu_video_accelerator_factories.h

Index: media/renderers/gpu_video_accelerator_factories.h
diff --git a/media/renderers/gpu_video_accelerator_factories.h b/media/renderers/gpu_video_accelerator_factories.h
index 13baff76e59f11cb9426f312f783d0aa3bdb7336..f725b7332d530e2bdf5d30ce9ce16b8b87c6cca7 100644
--- a/media/renderers/gpu_video_accelerator_factories.h
+++ b/media/renderers/gpu_video_accelerator_factories.h
@@ -80,6 +80,7 @@ class MEDIA_EXPORT GpuVideoAcceleratorFactories {
                               std::vector<gpu::Mailbox>* texture_mailboxes,
                               uint32_t texture_target) = 0;
   virtual void DeleteTexture(uint32_t texture_id) = 0;
+  virtual gpu::SyncToken CreateSyncToken() = 0;
 
   virtual void WaitSyncToken(const gpu::SyncToken& sync_token) = 0;