Added initial set of logging for AudioOutputController.

content/browser/renderer_host/media/audio_output_delegate_impl.cc

Index: content/browser/renderer_host/media/audio_output_delegate_impl.cc
diff --git a/content/browser/renderer_host/media/audio_output_delegate_impl.cc b/content/browser/renderer_host/media/audio_output_delegate_impl.cc
index 3625fcbfefaaa18f1dabe65e3af7eabbc3175f99..892e54caf65214379c455c74deeb90df09920f65 100644
--- a/content/browser/renderer_host/media/audio_output_delegate_impl.cc
+++ b/content/browser/renderer_host/media/audio_output_delegate_impl.cc
@@ -12,6 +12,7 @@
 #include "content/browser/media/capture/audio_mirroring_manager.h"
 #include "content/browser/media/media_internals.h"
 #include "content/browser/renderer_host/media/audio_sync_reader.h"
+#include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/media_observer.h"
 #include "media/audio/audio_output_controller.h"
@@ -34,6 +35,8 @@ class AudioOutputDelegateImpl::ControllerEventHandler
   void OnControllerPaused() override;
   void OnControllerError() override;
 
+  void OnLog(const std::string& message) override;
+
   base::WeakPtr<AudioOutputDelegateImpl> delegate_;
 };
 
@@ -68,6 +71,13 @@ void AudioOutputDelegateImpl::ControllerEventHandler::OnControllerError() {
       base::BindOnce(&AudioOutputDelegateImpl::OnError, delegate_));
 }
 
+void AudioOutputDelegateImpl::ControllerEventHandler::OnLog(
+    const std::string& message) {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&AudioOutputDelegateImpl::DoLog, delegate_, message));
+}
+
 std::unique_ptr<media::AudioOutputDelegate> AudioOutputDelegateImpl::Create(
     EventHandler* handler,
     media::AudioManager* audio_manager,
@@ -221,6 +231,15 @@ void AudioOutputDelegateImpl::OnError() {
   subscriber_->OnStreamError(stream_id_);
 }
 
+void AudioOutputDelegateImpl::DoLog(const std::string& msg) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  std::ostringstream oss;
+  oss << "[stream_id=" << stream_id_ << "] " << msg;
+  const std::string message = oss.str();
+  content::MediaStreamManager::SendMessageToNativeLog(message);
+  DVLOG(1) << message;
+}
+
 media::AudioOutputController* AudioOutputDelegateImpl::GetControllerForTesting()
     const {
   return controller_.get();