Allow some Android media player implementation to be overridden by embedders.

media/base/android/media_player_android.cc

Index: media/base/android/media_player_android.cc
diff --git a/media/base/android/media_player_android.cc b/media/base/android/media_player_android.cc
index f5f61c00a4a7915f0ad4ef07534d44ec410db628..ae4245a27e96dcf0789e8d5c87fa54ebf215cd59 100644
--- a/media/base/android/media_player_android.cc
+++ b/media/base/android/media_player_android.cc
@@ -72,4 +72,12 @@ void MediaPlayerAndroid::ReadFromDemuxerAck(
   NOTREACHED() << "Unexpected ipc received";
 }
 
+GURL MediaPlayerAndroid::GetUrl() {
+  return GURL();
+}
+
+GURL MediaPlayerAndroid::GetFirstPartyForCookies() {
+  return GURL();
+}
+
 }  // namespace media