Added stub MediaSourcePlayer for developing behind the flag

media/base/android/BUILD.gn

 # 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/arm.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 
@@ skipping 24 matching lines @@
     "media_player_android.h",
     "media_player_bridge.cc",
     "media_player_bridge.h",
     "media_player_listener.cc",
     "media_player_listener.h",
     "media_player_manager.h",
     "media_resource_getter.cc",
     "media_resource_getter.h",
     "media_source_player.cc",
     "media_source_player.h",
+    "media_source_player_impl.cc",
+    "media_source_player_impl.h",
+    "media_source_player_with_dedicated_thread.cc",
+    "media_source_player_with_dedicated_thread.h",
     "media_url_interceptor.h",
     "video_decoder_job.cc",
     "video_decoder_job.h",
     "webaudio_media_codec_bridge.cc",
     "webaudio_media_codec_bridge.h",
     "webaudio_media_codec_info.h",
   ]
   configs += [
     "//media:media_config",
     "//media:media_implementation",
@@ skipping 58 matching lines @@
 
 android_library("media_java") {
   deps = [
     "//base:base_java",
   ]
 
   srcjar_deps = [ ":media_java_enums_srcjar" ]
 
   DEPRECATED_java_in_dir = "java/src"
 }