Pass origin to StartObservingMediaSinks.

chrome/browser/media/router/media_router_mojo_impl.h

Index: chrome/browser/media/router/media_router_mojo_impl.h
diff --git a/chrome/browser/media/router/media_router_mojo_impl.h b/chrome/browser/media/router/media_router_mojo_impl.h
index 84e25577ee9e14abe13f6abf06777b5a949b9815..17b6bb1d412470c89afed964382b069a7924a424 100644
--- a/chrome/browser/media/router/media_router_mojo_impl.h
+++ b/chrome/browser/media/router/media_router_mojo_impl.h
@@ -168,6 +168,8 @@ class MediaRouterMojoImpl : public MediaRouterBase,
     // True if cached result is available.
     bool has_cached_result = false;
 
+    GURL origin;
+
     // Cached list of sinks for the query, if |has_cached_result| is true.
     // Empty otherwise.
     std::vector<MediaSink> cached_sink_list;
@@ -255,7 +257,8 @@ class MediaRouterMojoImpl : public MediaRouterBase,
                                   const SendRouteMessageCallback& callback);
   void DoListenForRouteMessages(const MediaRoute::Id& route_id);
   void DoStopListeningForRouteMessages(const MediaRoute::Id& route_id);
-  void DoStartObservingMediaSinks(const MediaSource::Id& source_id);
+  void DoStartObservingMediaSinks(const MediaSource::Id& source_id,
+                                  const GURL& origin);
   void DoStopObservingMediaSinks(const MediaSource::Id& source_id);
   void DoStartObservingMediaRoutes(const MediaSource::Id& source_id);
   void DoStopObservingMediaRoutes(const MediaSource::Id& source_id);