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

remoting/client/plugin/chromoting_instance.cc

Index: remoting/client/plugin/chromoting_instance.cc
diff --git a/remoting/client/plugin/chromoting_instance.cc b/remoting/client/plugin/chromoting_instance.cc
index 90db58344b3f2324574d56baa893dca5d9181a33..b4b631be2cb8988147b13e4443e57e4eb0b25b64 100644
--- a/remoting/client/plugin/chromoting_instance.cc
+++ b/remoting/client/plugin/chromoting_instance.cc
@@ -658,9 +658,15 @@ void ChromotingInstance::HandleConnect(const base::DictionaryValue& data) {
   if (!plugin_view_.is_null())
     video_renderer_->OnViewChanged(plugin_view_);
 
+  if (!audio_player_) {
+    audio_player_.reset(new PepperAudioPlayer(this));
+  }
+
   client_.reset(
-      new ChromotingClient(&context_, this, video_renderer_.get(),
-                           base::WrapUnique(new PepperAudioPlayer(this))));
+      new ChromotingClient(&context_,
+                           this,
+                           video_renderer_.get(),
+                           audio_player_.get());
 
   // Setup the signal strategy.
   signal_strategy_.reset(new DelegatingSignalStrategy(
@@ -973,6 +979,7 @@ void ChromotingInstance::Disconnect() {
   mouse_input_filter_.set_input_stub(nullptr);
   client_.reset();
   video_renderer_.reset();
+  audio_player_.reset();
   stats_update_timer_.Stop();
 }
 
@@ -1058,7 +1065,7 @@ bool ChromotingInstance::LogToUI(int severity, const char* file, int line,
                                  size_t message_start,
                                  const std::string& str) {
   PP_LogLevel log_level = PP_LOGLEVEL_ERROR;
-  switch(severity) {
+  switch (severity) {
     case logging::LOG_INFO:
       log_level = PP_LOGLEVEL_TIP;
       break;