Pass origin to StartObservingMediaSinks.

chrome/browser/media/router/media_sinks_observer.h

Index: chrome/browser/media/router/media_sinks_observer.h
diff --git a/chrome/browser/media/router/media_sinks_observer.h b/chrome/browser/media/router/media_sinks_observer.h
index da9f517967fce9f322c9569b61bb961212ccfeb8..1a84f8bd871ba86b04447d43ef4b606ad06f7a88 100644
--- a/chrome/browser/media/router/media_sinks_observer.h
+++ b/chrome/browser/media/router/media_sinks_observer.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "chrome/browser/media/router/media_sink.h"
 #include "chrome/browser/media/router/media_source.h"
+#include "url/gurl.h"
 
 namespace media_router {
 
@@ -25,7 +26,8 @@ class MediaSinksObserver {
  public:
   // Constructs an observer that will observe for sinks compatible
   // with |source|.
-  MediaSinksObserver(MediaRouter* router, const MediaSource& source);
+  MediaSinksObserver(MediaRouter* router,
+                     const MediaSource& source);
   virtual ~MediaSinksObserver();
 
   // Registers with MediaRouter to start observing. Must be called before the
@@ -38,7 +40,8 @@ class MediaSinksObserver {
   // Implementations may not perform operations that modify the Media Router's
   // observer list. In particular, invoking this observer's destructor within
   // OnSinksReceived will result in undefined behavior.
-  virtual void OnSinksReceived(const std::vector<MediaSink>& sinks) {}
+  virtual void OnSinksReceived(const MediaSource& source,
+                               const std::vector<MediaSink>& sinks) {}
 
   const MediaSource& source() const { return source_; }