Send kStopMark from AudioOutputController to stop AudioThread in renderer

media/audio/audio_output_controller.cc

Index: media/audio/audio_output_controller.cc
===================================================================
--- media/audio/audio_output_controller.cc	(revision 131586)
+++ media/audio/audio_output_controller.cc	(working copy)
@@ -16,8 +16,9 @@
 
 namespace media {
 
-// Signal a pause in low-latency mode.
+// Special signals to send to the renderer in low-latency mode.
 const int AudioOutputController::kPauseMark = -1;
+const int AudioOutputController::kStopMark = -2;
 
 // Polling-related constants.
 const int AudioOutputController::kPollNumAttempts = 3;
@@ -303,6 +304,7 @@
     DoStopCloseAndClearStream(NULL);
 
     if (LowLatencyMode()) {
+      sync_reader_->UpdatePendingBytes(kStopMark);
       sync_reader_->Close();
     }