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

content/common/gpu/media/v4l2_video_encode_accelerator.h

 // Copyright 2014 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_V4L2_VIDEO_ENCODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_ENCODE_ACCELERATOR_H_
 
 #include <linux/videodev2.h>
 #include <list>
 #include <vector>
 
 #include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/media/v4l2_device.h"
 #include "content/common/gpu/media/v4l2_image_processor.h"
 #include "media/video/video_encode_accelerator.h"
 #include "ui/gfx/geometry/size.h"
 
+namespace base {
+
+class MessageLoopProxy;
+
+}  // namespace base
+
 namespace media {
 
 class BitstreamBuffer;
 
 }  // namespace media
 
 namespace content {
 
 // This class handles video encode acceleration by interfacing with a V4L2
 // device exposed by the codec hardware driver. The threading model of this
@@ skipping 148 matching lines @@
   bool CreateInputBuffers();
   bool CreateOutputBuffers();
 
   // Destroy these buffers.
   void DestroyInputBuffers();
   void DestroyOutputBuffers();
 
   // Set controls in |ctrls| and return true if successful.
   bool SetExtCtrls(std::vector<struct v4l2_ext_control> ctrls);
 
-  // Our original calling task runner for the child thread.
-  const scoped_refptr<base::SingleThreadTaskRunner> child_task_runner_;
+  // Our original calling message loop for the child thread.
+  const scoped_refptr<base::MessageLoopProxy> child_message_loop_proxy_;
 
   gfx::Size visible_size_;
   // Input allocated size required by the device.
   gfx::Size input_allocated_size_;
   size_t output_buffer_byte_size_;
 
   // Formats for input frames and the output stream.
   media::VideoFrame::Format device_input_format_;
   size_t input_planes_count_;
   uint32 output_format_fourcc_;
@@ skipping 48 matching lines @@
   // This thread services tasks posted from the VEA API entry points by the
   // child thread and device service callbacks posted from the device thread.
   base::Thread encoder_thread_;
 
   // The device polling thread handles notifications of V4L2 device changes.
   // TODO(sheu): replace this thread with an TYPE_IO encoder_thread_.
   base::Thread device_poll_thread_;
 
   // To expose client callbacks from VideoEncodeAccelerator.
   // NOTE: all calls to these objects *MUST* be executed on
-  // child_task_runner_.
+  // child_message_loop_proxy_.
   base::WeakPtr<Client> client_;
   scoped_ptr<base::WeakPtrFactory<Client> > client_ptr_factory_;
 
   // WeakPtr<> pointing to |this| for use in posting tasks from the
   // image_processor_ back to the child thread.
   // Tasks posted onto encoder and poll threads can use base::Unretained(this),
   // as both threads will not outlive this object.
   base::WeakPtr<V4L2VideoEncodeAccelerator> weak_this_;
   base::WeakPtrFactory<V4L2VideoEncodeAccelerator> weak_this_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(V4L2VideoEncodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_ENCODE_ACCELERATOR_H_