Chromecast: split DummyMediaTaskRunner class into its own file.

chromecast/media/media.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'chromecast_branding%': 'Chromium',
     'libcast_media_gyp%': '',
     'use_default_libcast_media%': 1,
@@ skipping 83 matching lines @@
         'cma/base/coded_frame_provider.cc',
         'cma/base/coded_frame_provider.h',
         'cma/base/decoder_buffer_adapter.cc',
         'cma/base/decoder_buffer_adapter.h',
         'cma/base/decoder_buffer_base.cc',
         'cma/base/decoder_buffer_base.h',
         'cma/base/decoder_config_adapter.cc',
         'cma/base/decoder_config_adapter.h',
         'cma/base/media_task_runner.cc',
         'cma/base/media_task_runner.h',
+        'cma/base/simple_media_task_runner.cc',
+        'cma/base/simple_media_task_runner.h',         
       ],
     },
     {
       'target_name': 'cma_backend',
       'type': '<(component)',
       'dependencies': [
         'cma_base',
         'media_base',
         '../../base/base.gyp:base',
         '../../media/media.gyp:media',
@@ skipping 194 matching lines @@
             '../..',
           ],
           'sources': [
             'base/cast_media_default.cc',
           ],
         }
       ]
     }],
   ],
 }