Plumb media data from renderers up to MediaInternals in the browser process.

content/browser/renderer_host/media/media_observer.h

Index: content/browser/renderer_host/media/media_observer.h
diff --git a/content/browser/renderer_host/media/media_observer.h b/content/browser/renderer_host/media/media_observer.h
index 50e42e085f9111bb5f9014366063bc11786ff5b1..6c5f0569126c47a56943c4fcf9bc304d1519b8bd 100644
--- a/content/browser/renderer_host/media/media_observer.h
+++ b/content/browser/renderer_host/media/media_observer.h
@@ -6,6 +6,10 @@
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_OBSERVER_H_
 #pragma once
 
+namespace media {
+struct MediaLogEvent;
+}
+
 // A class may implement MediaObserver and register itself with ResourceContext
 // to receive callbacks as media events occur.
 class MediaObserver {
@@ -27,6 +31,10 @@ class MediaObserver {
   // Called when the volume of an audio stream is set.
   virtual void OnSetAudioStreamVolume(void* host, int stream_id,
                                       double volume) = 0;
+
+  // Called when a MediaEvent occurs.
+  virtual void OnMediaEvent(int render_process_id,
+                            const media::MediaLogEvent& event) = 0;
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_OBSERVER_H_