Post GpuMemoryBufferVideoFramePool deletion on media thread

media/video/gpu_memory_buffer_video_frame_pool.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_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "base/task_runner.h"
 #include "media/base/video_frame.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 class GpuVideoAcceleratorFactories;
 
@@ skipping 21 matching lines @@
   // 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);
 
+  base::WeakPtr<GpuMemoryBufferVideoFramePool> GetWeakPtr();

[mcasas, 2016/02/11 15:40:41]

nit: for cases like this you can also make the class a
base::SupportsWeakPtr [1], although in this case it
might interact in funny ways with |pool_impl_| 
destruction.


[1]
https://code.google.com/p/chromium/codesearch#chromium/src/base/memory/weak_p...

+
  private:
   class PoolImpl;
   scoped_refptr<PoolImpl> pool_impl_;
+  base::WeakPtrFactory<GpuMemoryBufferVideoFramePool> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferVideoFramePool);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_POOL_H_