Media Related changes for TabCapture API

chrome/browser/media/media_internals_observer.h

Index: chrome/browser/media/media_internals_observer.h
diff --git a/chrome/browser/media/media_internals_observer.h b/chrome/browser/media/media_internals_observer.h
index 3c9be62d8d8647e25c165976421a4eab5c230861..aeff476cc9992bb11c7d3d9768716c5628253c68 100644
--- a/chrome/browser/media/media_internals_observer.h
+++ b/chrome/browser/media/media_internals_observer.h
@@ -5,12 +5,20 @@
 #ifndef CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_OBSERVER_H_
 #define CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_OBSERVER_H_
 
+#include "content/public/common/media_stream_request.h"
+
 // Used by MediaInternalsUI to receive callbacks on media events.
 // Callbacks will be on the IO thread.
 class MediaInternalsObserver {
  public:
   // Handle an information update consisting of a javascript function call.
-  virtual void OnUpdate(const string16& javascript) = 0;
+  virtual void OnUpdate(const string16& javascript) {}
+
+  // Handle an information update related to a media stream request.
+  virtual void OnRequestUpdate(
+      const content::MediaStreamDevice& device,
+      const content::MediaStreamRequest::RequestState state) {}
+
   virtual ~MediaInternalsObserver() {}
 };