Added stub MediaSourcePlayer for developing behind the flag

content/browser/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/browser/browser.gni")
 import("//media/media_options.gni")
 
@@ skipping 327 matching lines @@
       "speech/google_streaming_remote_engine.cc",
       "speech/google_streaming_remote_engine.h",
       "speech/speech_recognition_engine.cc",
       "speech/speech_recognition_engine.h",
       "speech/speech_recognizer_impl.cc",
       "speech/speech_recognizer_impl.h",
     ]
     deps += [
       "//content/public/android:jni",
       "//media",
+      "//media/base/android:android",

[no sievers, 2015/05/08 22:17:39]

Why doesn't content_browser depend on this in gyp?
The gyp dependencies for player_android are weird.

       "//mojo/android:libsystem_java",
       "//ui/android",
     ]
     libs += [ "jnigraphics" ]
   }
 
   if (is_mac) {
     sources -= [
       "device_sensors/data_fetcher_shared_memory_default.cc",
       "geolocation/empty_wifi_data_provider.cc",
@@ skipping 100 matching lines @@
   }
 
   if (is_linux && use_openssl) {
     deps += [ "//third_party/boringssl" ]
   }
 
   if (enable_media_mojo_renderer) {
     deps += [ "//media/mojo/services:renderer_service" ]
   }
 }