Adding an interface to allow extention of the audio player for CRD and iOS.

remoting/client/audio_player_android.cc

Index: remoting/client/audio_player_android.cc
diff --git a/remoting/client/audio_player_android.cc b/remoting/client/audio_player_android.cc
index cd4909668a7e587013b7974036b3213b86a53f55..8ee6f864786c4a223e6f4e56a098c494732de62f 100644
--- a/remoting/client/audio_player_android.cc
+++ b/remoting/client/audio_player_android.cc
@@ -15,7 +15,7 @@ static_assert(AudioPlayer::kChannels == 2,
               "AudioPlayer must be feeding 2 channels data.");
 const int kChannelMask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
 
-AudioPlayerAndroid::AudioPlayerAndroid() {
+AudioPlayerAndroid::AudioPlayerAndroid() : weak_factory_(this) {
   if (slCreateEngine(&engine_object_, 0, nullptr, 0, nullptr, nullptr) !=
           SL_RESULT_SUCCESS ||
       (*engine_object_)->Realize(engine_object_, SL_BOOLEAN_FALSE) !=
@@ -41,6 +41,10 @@ AudioPlayerAndroid::~AudioPlayerAndroid() {
   }
 }
 
+base::WeakPtr<AudioPlayerAndroid> AudioPlayerAndroid::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 uint32_t AudioPlayerAndroid::GetSamplesPerFrame() {
   return sample_per_frame_;
 }