[MediaRouter] The minimal change to make everything build on Android.

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>
 
 #include "base/callback.h"
 #include "chrome/browser/media/router/issue.h"
 #include "chrome/browser/media/router/media_route.h"
 #include "chrome/browser/media/router/media_sink.h"
 #include "chrome/browser/media/router/media_source.h"
+#include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/presentation_session_message.h"
 
 namespace media_router {
 
 class IssuesObserver;
 class MediaRoutesObserver;
 class MediaSinksObserver;
 
 // Type of callback used in |CreateRoute()|. Callback is invoked when the
 // route request either succeeded or failed.
 // The first argument is the route created. If the route request failed, this
 // will be a nullptr.
 // The second argument is the error string, which will be nonempty if the route
 // request failed.
 using MediaRouteResponseCallback =
     base::Callback<void(scoped_ptr<MediaRoute>, const std::string&)>;
 
 // Used in cases where a tab ID is not applicable in CreateRoute/JoinRoute.
 const int kInvalidTabId = -1;
 
 // 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 {
+// posting messages or closing). Is a KeyedService.

[imcheng, 2015/07/16 18:28:19]

This comment is redundant as the reader can easily infer that from the line
below.

[whywhat, 2015/07/16 20:17:18]

Done.

+class MediaRouter : public KeyedService {
  public:
   using PresentationSessionMessageCallback = base::Callback<void(
       scoped_ptr<ScopedVector<content::PresentationSessionMessage>>)>;
   using SendRouteMessageCallback = base::Callback<void(bool sent)>;
 
-  virtual ~MediaRouter() {}
+  ~MediaRouter() override = default;
 
   // Creates a media route from |source_id| to |sink_id|.
   // |origin| is the URL of requestor's page.
   // |tab_id| is the ID of the tab in which the request was made.
   // |origin| and |tab_id| are used for enforcing same-origin and/or same-tab
   // scope for JoinRoute() requests. (e.g., if enforced, the page
   // requesting JoinRoute() must have the same origin as the page that requested
   // CreateRoute()).
   // The caller may pass in|kInvalidTabId| if tab is not applicable.
   // |callback| is invoked with a response indicating success or failure.
@@ skipping 78 matching lines @@
   // in undefined behavior.
   virtual void RegisterIssuesObserver(IssuesObserver* observer) = 0;
 
   // Removes the IssuesObserver |observer|.
   virtual void UnregisterIssuesObserver(IssuesObserver* observer) = 0;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_H_