MediaLog: Log selected audio/video decoder name.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index bed92998d3670c8370328271bc5d9f55147a2df3..33fa69cf72ecd6b4b2ce4b3d23b074d3135c9abf 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -132,6 +132,13 @@ static void LogMediaSourceError(const scoped_refptr<MediaLog>& media_log,
   media_log->AddEvent(media_log->CreateMediaSourceErrorEvent(error));
 }
 
+// Note: The log will appear in chrome://media-internals page. Only log info
+// that's worht logging.
+static void LogMediaInfo(const scoped_refptr<MediaLog>& media_log,
+                         const std::string& info) {
+  media_log->AddEvent(media_log->CreateInfoEvent(info));
+}
+
 WebMediaPlayerImpl::WebMediaPlayerImpl(
     blink::WebLocalFrame* frame,
     blink::WebMediaPlayerClient* client,
@@ -840,16 +847,17 @@ scoped_ptr<Renderer> WebMediaPlayerImpl::CreateRenderer() {
   // Create our audio decoders and renderer.
   ScopedVector<AudioDecoder> audio_decoders;
 
-  LogCB log_cb = base::Bind(&LogMediaSourceError, media_log_);
-  audio_decoders.push_back(new FFmpegAudioDecoder(media_task_runner_, log_cb));
-  audio_decoders.push_back(new OpusAudioDecoder(media_task_runner_));
+  audio_decoders.push_back(new media::FFmpegAudioDecoder(
+      media_task_runner_, base::Bind(&LogMediaSourceError, media_log_)));
+  audio_decoders.push_back(new media::OpusAudioDecoder(media_task_runner_));
 
   scoped_ptr<AudioRenderer> audio_renderer(new AudioRendererImpl(
       media_task_runner_,
       audio_source_provider_.get(),
       audio_decoders.Pass(),
       set_decryptor_ready_cb,
-      audio_hardware_config_));
+      audio_hardware_config_,
+      base::Bind(&LogMediaInfo, media_log_)));
 
   // Create our video decoders and renderer.
   ScopedVector<VideoDecoder> video_decoders;
@@ -871,7 +879,8 @@ scoped_ptr<Renderer> WebMediaPlayerImpl::CreateRenderer() {
           video_decoders.Pass(),
           set_decryptor_ready_cb,
           base::Bind(&WebMediaPlayerImpl::FrameReady, base::Unretained(this)),
-          true));
+          true,
+          base::Bind(&LogMediaInfo, media_log_)));
 
   // Create renderer.
   return scoped_ptr<Renderer>(new RendererImpl(