Added stub MediaSourcePlayer for developing behind the flag

media/media.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 1685 matching lines @@
             'base/android/media_player_android.h',
             'base/android/media_player_bridge.cc',
             'base/android/media_player_bridge.h',
             'base/android/media_player_listener.cc',
             'base/android/media_player_listener.h',
             'base/android/media_player_manager.h',
             'base/android/media_resource_getter.cc',
             'base/android/media_resource_getter.h',
             'base/android/media_source_player.cc',
             'base/android/media_source_player.h',
+            'base/android/media_source_player_impl.cc',
+            'base/android/media_source_player_impl.h',
+            'base/android/media_source_player_with_dedicated_thread.cc',
+            'base/android/media_source_player_with_dedicated_thread.h',
             'base/android/media_url_interceptor.h',
             'base/android/video_decoder_job.cc',
             'base/android/video_decoder_job.h',
             'base/android/webaudio_media_codec_bridge.cc',
             'base/android/webaudio_media_codec_bridge.h',
             'base/android/webaudio_media_codec_info.h',
           ],
           'dependencies': [
             '../base/base.gyp:base',
             '../third_party/widevine/cdm/widevine_cdm.gyp:widevine_cdm_version_h',
@@ skipping 175 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'media_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }