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

content/renderer/media/renderer_gpu_video_accelerator_factories.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_RENDERER_GPU_VIDEO_ACCELERATOR_FACTORIES_H_
 #define CONTENT_RENDERER_MEDIA_RENDERER_GPU_VIDEO_ACCELERATOR_FACTORIES_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 52 matching lines @@
   std::unique_ptr<media::VideoEncodeAccelerator> CreateVideoEncodeAccelerator()
       override;
   // Creates textures and produces them into mailboxes. Returns true on success
   // or false on failure.
   bool CreateTextures(int32_t count,
                       const gfx::Size& size,
                       std::vector<uint32_t>* texture_ids,
                       std::vector<gpu::Mailbox>* texture_mailboxes,
                       uint32_t texture_target) override;
   void DeleteTexture(uint32_t texture_id) override;
+  gpu::SyncToken CreateSyncToken() override;
   void WaitSyncToken(const gpu::SyncToken& sync_token) override;
 
   std::unique_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) override;
 
   bool ShouldUseGpuMemoryBuffersForVideoFrames() const override;
   unsigned ImageTextureTarget(gfx::BufferFormat format) override;
   media::VideoPixelFormat VideoFrameOutputFormat() override;
@@ skipping 45 matching lines @@
 
   // For sending requests to allocate shared memory in the Browser process.
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererGpuVideoAcceleratorFactories);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RENDERER_GPU_VIDEO_ACCELERATOR_FACTORIES_H_