[MediaRouter] Update MR-2-Extension's PostMessage to return boolean.

chrome/browser/media/router/media_router.h

Index: chrome/browser/media/router/media_router.h
diff --git a/chrome/browser/media/router/media_router.h b/chrome/browser/media/router/media_router.h
index 0699d3f86bf8c26371cc08a93a19e59f515572da..a35a558a8bc2b426cc5e2737cd54009e12e8db0b 100644
--- a/chrome/browser/media/router/media_router.h
+++ b/chrome/browser/media/router/media_router.h
@@ -29,6 +29,8 @@ class MediaSinksObserver;
 using MediaRouteResponseCallback =
     base::Callback<void(scoped_ptr<MediaRoute>, const std::string&)>;
 
+using SendMessageCallback = base::Callback<void(bool sent)>;

[Kevin M, 2015/06/11 22:45:24]

Make this a child of MediaRouter

[haibinlu, 2015/06/11 23:05:22]

Done.

+
 // An interface for handling resources related to media routing.
 // Responsible for registering observers for receiving sink availability
 // updates, handling route requests/responses, and operating on routes (e.g.
@@ -49,8 +51,9 @@ class MediaRouter {
   // Posts |message| to a MediaSink connected via MediaRoute with |route_id|.
   // TODO(imcheng): Support additional data types: Blob, ArrayBuffer,
   // ArrayBufferView.
-  virtual void PostMessage(const MediaRoute::Id& route_id,
-                           const std::string& message) = 0;
+  virtual void SendMessage(const MediaRoute::Id& route_id,
+                           const std::string& message,
+                           const SendMessageCallback& callback) = 0;
 
   // Clears the issue with the id |issue_id|.
   virtual void ClearIssue(const Issue::Id& issue_id) = 0;