Make AudioOutputDevice restartable and reinitializable

content/browser/renderer_host/media/audio_sync_reader.cc

Index: content/browser/renderer_host/media/audio_sync_reader.cc
diff --git a/content/browser/renderer_host/media/audio_sync_reader.cc b/content/browser/renderer_host/media/audio_sync_reader.cc
index 85b13f8453c4da6f8e3ca359f75c1b36406e693b..9b4de6d60d427d7b85da666ea8d06732f256ef85 100644
--- a/content/browser/renderer_host/media/audio_sync_reader.cc
+++ b/content/browser/renderer_host/media/audio_sync_reader.cc
@@ -105,6 +105,7 @@ void AudioSyncReader::UpdatePendingBytes(uint32_t bytes,
 }
 
 void AudioSyncReader::Read(AudioBus* dest) {
+//  printf("--+--+--+--+-- AudioSyncReader::Read enter\n");
   ++renderer_callback_count_;
   if (!WaitUntilDataIsReady()) {
     ++renderer_missed_callback_count_;
@@ -115,6 +116,7 @@ void AudioSyncReader::Read(AudioBus* dest) {
         LOG(WARNING) << "(log cap reached, suppressing further logs)";
     }
     dest->Zero();
+//    printf("--+--+--+--+-- AudioSyncReader::Read exit 1\n");
     return;
   }
 
@@ -122,6 +124,8 @@ void AudioSyncReader::Read(AudioBus* dest) {
     dest->Zero();
   else
     output_bus_->CopyTo(dest);
+
+//  printf("--+--+--+--+-- AudioSyncReader::Read exit 2\n");
 }
 
 void AudioSyncReader::Close() {