Revert of content/common: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/common/gpu/media/gpu_video_decode_accelerator.h

 // Copyright (c) 2012 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_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <map>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/shared_memory.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/common/gpu/gpu_command_buffer_stub.h"
 #include "gpu/command_buffer/service/texture_manager.h"
 #include "gpu/config/gpu_info.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/geometry/size.h"
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace content {
 
 class GpuVideoDecodeAccelerator
     : public IPC::Listener,
       public IPC::Sender,
       public media::VideoDecodeAccelerator::Client,
       public GpuCommandBufferStub::DestructionObserver {
  public:
   // Each of the arguments to the constructor must outlive this object.
   // |stub->decoder()| will be made current around any operation that touches
   // the underlying VDA so that it can make GL calls safely.
   GpuVideoDecodeAccelerator(
       int32 host_route_id,
       GpuCommandBufferStub* stub,
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
+      const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
 
   // IPC::Listener implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // media::VideoDecodeAccelerator::Client implementation.
   void ProvidePictureBuffers(uint32 requested_num_of_buffers,
                              const gfx::Size& dimensions,
                              uint32 texture_target) override;
   void DismissPictureBuffer(int32 picture_buffer_id) override;
   void PictureReady(const media::Picture& picture) override;
@@ skipping 81 matching lines @@
   // The texture target as requested by ProvidePictureBuffers().
   uint32 texture_target_;
 
   // The message filter to run VDA::Decode on IO thread if VDA supports it.
   scoped_refptr<MessageFilter> filter_;
 
   // Used to wait on for |filter_| to be removed, before we can safely
   // destroy the VDA.
   base::WaitableEvent filter_removed_;
 
-  // GPU child thread task runner.
-  const scoped_refptr<base::SingleThreadTaskRunner> child_task_runner_;
+  // GPU child message loop.
+  const scoped_refptr<base::MessageLoopProxy> child_message_loop_;
 
-  // GPU IO thread task runner.
-  const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+  // GPU IO message loop.
+  const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
 
   // Weak pointers will be invalidated on IO thread.
   base::WeakPtrFactory<Client> weak_factory_for_io_;
 
   // Protects |uncleared_textures_| when DCHECK is on. This is for debugging
   // only. We don't want to hold a lock on IO thread. When DCHECK is off,
   // |uncleared_textures_| is only accessed from the child thread.
   base::Lock debug_uncleared_textures_lock_;
 
   // A map from picture buffer ID to TextureRef that have not been cleared.
   std::map<int32, scoped_refptr<gpu::gles2::TextureRef> > uncleared_textures_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(GpuVideoDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_