Use enum instead of string in MessageLoopFactory::GetMessageLoop*

media/tools/player_x11/player_x11.cc

 // 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.
 
 #include <signal.h>
 
 #include <iostream>  // NOLINT
 
 #include "base/at_exit.h"
 #include "base/bind.h"
@@ skipping 80 matching lines @@
   }
 
   scoped_refptr<media::VideoFrame> video_frame;
   g_video_renderer->GetCurrentFrame(&video_frame);
   if (video_frame)
     paint_cb.Run(video_frame);
   g_video_renderer->PutCurrentFrame(video_frame);
 }
 
 // TODO(vrk): Re-enabled audio. (crbug.com/112159)
-bool InitPipeline(MessageLoop* message_loop,
+bool InitPipeline(const scoped_refptr<base::MessageLoopProxy>& message_loop,
                   const scoped_refptr<media::DataSource>& data_source,
                   const PaintCB& paint_cb,
                   bool /* enable_audio */,
                   scoped_refptr<media::Pipeline>* pipeline,
                   MessageLoop* paint_message_loop,
                   media::MessageLoopFactory* message_loop_factory) {
   // Load media libraries.
   if (!media::InitializeMediaLibrary(FilePath())) {
     std::cout << "Unable to initialize the media library." << std::endl;
     return false;
   }
 
   // Create our filter factories.
   scoped_ptr<media::FilterCollection> collection(
       new media::FilterCollection());
   collection->SetDemuxer(new media::FFmpegDemuxer(message_loop, data_source));
   collection->AddAudioDecoder(new media::FFmpegAudioDecoder(
       base::Bind(&media::MessageLoopFactory::GetMessageLoop,
                  base::Unretained(message_loop_factory),
-                 "AudioDecoderThread")));
+                 media::MessageLoopFactory::kAudioDecoder)));
   collection->GetVideoDecoders()->push_back(new media::FFmpegVideoDecoder(
       base::Bind(&media::MessageLoopFactory::GetMessageLoop,
                  base::Unretained(message_loop_factory),
-                 "VideoDecoderThread"),
+                 media::MessageLoopFactory::kVideoDecoder),
       NULL));
 
   // Create our video renderer and save a reference to it for painting.
   g_video_renderer = new media::VideoRendererBase(
       base::Bind(&Paint, paint_message_loop, paint_cb),
       base::Bind(&SetOpaque),
       true);
   collection->AddVideoRenderer(g_video_renderer);
 
   collection->AddAudioRenderer(
@@ skipping 140 matching lines @@
         &GlVideoRenderer::Paint, new GlVideoRenderer(g_display, g_window));
   } else {
     paint_cb = base::Bind(
         &X11VideoRenderer::Paint, new X11VideoRenderer(g_display, g_window));
   }
 
   scoped_refptr<media::DataSource> data_source(
       new DataSourceLogger(CreateFileDataSource(filename),
                            command_line->HasSwitch("streaming")));
 
-  if (InitPipeline(thread->message_loop(), data_source,
+  if (InitPipeline(thread->message_loop_proxy(), data_source,
                    paint_cb, command_line->HasSwitch("audio"),
                    &pipeline, &message_loop, message_loop_factory.get())) {
     // Main loop of the application.
     g_running = true;
 
     message_loop.PostTask(FROM_HERE, base::Bind(
         &PeriodicalUpdate, pipeline, &message_loop, !pipeline->HasVideo()));
     message_loop.Run();
   } else {
     std::cout << "Pipeline initialization failed..." << std::endl;
   }
 
   // Cleanup tasks.
   message_loop_factory.reset();
 
   thread->Stop();
 
   // Release callback which releases video renderer. Do this before cleaning up
   // X below since the video renderer has some X cleanup duties as well.
   paint_cb.Reset();
 
   XDestroyWindow(g_display, g_window);
   XCloseDisplay(g_display);
   g_audio_manager = NULL;
 
   return 0;
 }