Log MediaSource parsing errors to the MediaLog so they can appear in chrome:media-internals.

media/base/media_log.cc

Index: media/base/media_log.cc
diff --git a/media/base/media_log.cc b/media/base/media_log.cc
index cadf29105489e241357ca7a2d678771cf53b16af..abd845b30053d57354c954fa93faed58d05b0c6e 100644
--- a/media/base/media_log.cc
+++ b/media/base/media_log.cc
@@ -54,6 +54,8 @@ const char* MediaLog::EventTypeToString(MediaLogEvent::Type type) {
       return "AUDIO_RENDERER_DISABLED";
     case MediaLogEvent::BUFFERED_EXTENTS_CHANGED:
       return "BUFFERED_EXTENTS_CHANGED";
+    case MediaLogEvent::MEDIA_SOURCE_ERROR:
+      return "MEDIA_SOURCE_ERROR";
   }
   NOTREACHED();
   return NULL;
@@ -98,6 +100,14 @@ const char* MediaLog::PipelineStatusToString(PipelineStatus status) {
   return NULL;
 }
 
+LogHelper::LogHelper(const LogCB& log_cb) : log_cb_(log_cb) {}
+
+LogHelper::~LogHelper() {
+  if (log_cb_.is_null())
+    return;
+  log_cb_.Run(stream_.str());
+}
+
 MediaLog::MediaLog() : id_(g_media_log_count.GetNext()) {}
 
 MediaLog::~MediaLog() {}
@@ -178,4 +188,12 @@ scoped_ptr<MediaLogEvent> MediaLog::CreateBufferedExtentsChangedEvent(
   return event.Pass();
 }
 
+scoped_ptr<MediaLogEvent> MediaLog::CreateMediaSourceErrorEvent(
+    const std::string& error) {
+  scoped_ptr<MediaLogEvent> event(
+      CreateEvent(MediaLogEvent::MEDIA_SOURCE_ERROR));
+  event->params.SetString("error", error);
+  return event.Pass();
+}
+
 }  //namespace media