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

media/renderers/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 MEDIA_RENDERERS_GPU_VIDEO_ACCELERATOR_FACTORIES_H_
 #define MEDIA_RENDERERS_GPU_VIDEO_ACCELERATOR_FACTORIES_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 62 matching lines @@
   virtual std::unique_ptr<VideoEncodeAccelerator>
   CreateVideoEncodeAccelerator() = 0;
 
   // Allocate & delete native textures.
   virtual 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) = 0;
   virtual void DeleteTexture(uint32_t texture_id) = 0;
+  virtual gpu::SyncToken CreateSyncToken() = 0;
 
   virtual void WaitSyncToken(const gpu::SyncToken& sync_token) = 0;
 
   virtual std::unique_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) = 0;
 
   virtual bool ShouldUseGpuMemoryBuffersForVideoFrames() const = 0;
   virtual unsigned ImageTextureTarget(gfx::BufferFormat format) = 0;
@@ skipping 20 matching lines @@
       GetVideoEncodeAcceleratorSupportedProfiles() = 0;
 
  protected:
   friend class base::RefCounted<GpuVideoAcceleratorFactories>;
   virtual ~GpuVideoAcceleratorFactories() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_RENDERERS_GPU_VIDEO_ACCELERATOR_FACTORIES_H_