media: split GpuMemoryBufferVideoFramePool into GpuMemoryBufferVideoFrameCopier/Pool

media/video/gpu_memory_buffer_video_frame_copier.h

 // Copyright 2015 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_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_POOL_H_
-#define MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_POOL_H_
+#ifndef MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_COPIER_H_
+#define MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_COPIER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/task_runner.h"
 #include "media/base/video_frame.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 class GpuVideoAcceleratorFactories;
 
-// Interface to a pool of GpuMemoryBuffers/textures/images that can be used to
-// transform software VideoFrames to VideoFrames backed by native textures.
-// The resources used by the VideoFrame created by the pool will be
-// automatically put back into the pool once the frame is destroyed.
-// The pool recycles resources to a void unnecessarily allocating and
-// destroying textures, images and GpuMemoryBuffer that could result
-// in a round trip to the browser/GPU process.
-class MEDIA_EXPORT GpuMemoryBufferVideoFramePool {
+// Interface to a copier that can be used to transform software VideoFrames to
+// VideoFrames backed by native textures.
+class MEDIA_EXPORT GpuMemoryBufferVideoFrameCopier {
  public:
-  GpuMemoryBufferVideoFramePool();
-  GpuMemoryBufferVideoFramePool(
+  GpuMemoryBufferVideoFrameCopier();
+  GpuMemoryBufferVideoFrameCopier(
       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
       const scoped_refptr<base::TaskRunner>& worker_task_runner,
       GpuVideoAcceleratorFactories* gpu_factories);
-  virtual ~GpuMemoryBufferVideoFramePool();
+  virtual ~GpuMemoryBufferVideoFrameCopier();
 
   // Callback used by MaybeCreateHardwareFrame to deliver a new VideoFrame
   // after it has been copied to GpuMemoryBuffers.
   typedef base::Callback<void(const scoped_refptr<VideoFrame>&)> FrameReadyCB;
 
   // Calls |cb| on |media_worker_pool| with a new VideoFrame containing only
   // mailboxes to native resources. |cb| will be destroyed on
   // |media_worker_pool|.
   // The content of the new object is copied from the software-allocated
   // |video_frame|.
   // If it's not possible to create a new hardware VideoFrame, |video_frame|
   // itself will passed to |cb|.
   virtual void MaybeCreateHardwareFrame(
       const scoped_refptr<VideoFrame>& video_frame,
       const FrameReadyCB& frame_ready_cb);
 
  private:
-  class PoolImpl;
-  scoped_refptr<PoolImpl> pool_impl_;
+  class CopierImpl;
+  scoped_refptr<CopierImpl> copier_impl_;
 
-  DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferVideoFramePool);
+  DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferVideoFrameCopier);
 };
 
 }  // namespace media
 
-#endif  // MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_POOL_H_
+#endif  // MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_COPIER_H_