Add GetCurrentRoutes() to MediaRouter API, ensure dialog has routes at init

chrome/browser/ui/webui/media_router/media_router_ui.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_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_UI_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 145 matching lines @@
 
   void InitForTest(MediaRouter* router,
                    content::WebContents* initiator,
                    MediaRouterWebUIMessageHandler* handler,
                    std::unique_ptr<CreatePresentationConnectionRequest>
                        create_session_request);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest, SortedSinks);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest, SortSinksByIconType);
-  FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest,
-                           UIMediaRoutesObserverFiltersNonDisplayRoutes);
-  FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest,
-      UIMediaRoutesObserverFiltersNonDisplayJoinableRoutes);
+  FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest, FilterNonDisplayRoutes);
+  FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest, FilterNonDisplayJoinableRoutes);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest,
       UIMediaRoutesObserverAssignsCurrentCastModes);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest,
       UIMediaRoutesObserverSkipsUnavailableCastModes);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest, GetExtensionNameExtensionPresent);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest,
                            GetExtensionNameEmptyWhenNotInstalled);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest,
                            GetExtensionNameEmptyWhenNotExtensionURL);
   FRIEND_TEST_ALL_PREFIXES(MediaRouterUITest,
@@ skipping 83 matching lines @@
       MediaSource::Id* source_id,
       GURL* origin,
       std::vector<MediaRouteResponseCallback>* route_response_callbacks,
       base::TimeDelta* timeout,
       bool* incognito);
 
   // Updates the set of supported cast modes and sends the updated set to
   // |handler_|.
   void UpdateCastModes();
 
+  // Updates the routes-to-cast-modes mapping in |current_cast_modes_| to match
+  // the value of |routes_|.
+  void UpdateCurrentCastModes();
+
   // Returns the default presentation request's frame URL if there is one.
   // Otherwise returns an empty GURL.
   GURL GetFrameURL() const;
 
   // Owned by the |web_ui| passed in the ctor, and guaranteed to be deleted
   // only after it has deleted |this|.
   MediaRouterWebUIMessageHandler* handler_;
 
   // These are non-null while this instance is registered to receive
   // updates from them.
@@ skipping 51 matching lines @@
   // NOTE: Weak pointers must be invalidated before all other member variables.
   // Therefore |weak_factory_| must be placed at the end.
   base::WeakPtrFactory<MediaRouterUI> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterUI);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_UI_H_