[Media Router] MediaRouterUI + WebUI handler implementation.

chrome/browser/media/router/media_router.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 18 matching lines @@
     base::Callback<void(scoped_ptr<MediaRoute>, const std::string&)>;
 
 // 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.
 // posting messages or closing).
 class MediaRouter {
  public:
   virtual ~MediaRouter() {}
 
   // Requests a media route from |source| to |sink_id|.

[Wez, 2015/05/20 17:51:45]

nit: Rephrase the comment to match the request->create renaming.

Does this method now create a new route, or potentially re-connect an existing
one?

[imcheng (use chromium acct), 2015/05/20 22:01:11]

Done. It only creates a new route. We will have a separate function for join.

   // |callback| is invoked with a response indicating success or failure.
-  virtual void RequestRoute(const MediaSourceId& source,
-                            const MediaSinkId& sink_id,
-                            const MediaRouteResponseCallback& callback) = 0;
+  virtual void CreateRoute(const MediaSourceId& source,
+                           const MediaSinkId& sink_id,
+                           const MediaRouteResponseCallback& callback) = 0;
 
   // Closes the media route specified by |route_id|.
   virtual void CloseRoute(const MediaRouteId& route_id) = 0;
 
   // Posts |message| to a MediaSink connected via MediaRoute with |route_id|.
   // TODO(imcheng): Support additional data types: Blob, ArrayBuffer,
   // ArrayBufferView.
   virtual void PostMessage(const MediaRouteId& route_id,
                            const std::string& message) = 0;
 
@@ skipping 38 matching lines @@
   virtual bool RegisterMediaRoutesObserver(MediaRoutesObserver* observer) = 0;
 
   // Removes a previously added MediaRoutesObserver. |observer| will stop
   // receiving further updates.
   virtual void UnregisterMediaRoutesObserver(MediaRoutesObserver* observer) = 0;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_H_