Show media router toolbar icon ephemerally for active local routes and issues

chrome/browser/media/router/media_router_ui_service_factory.h

 // Copyright 2016 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_UI_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_UI_SERVICE_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace media_router {
 
 class MediaRouterUIService;
 
 class MediaRouterUIServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
   static MediaRouterUIService* GetForBrowserContext(
       content::BrowserContext* context);
 
   static MediaRouterUIServiceFactory* GetInstance();
 
+  // By default, this factory returns a NULL service for TestingBrowserContext.
+  // Call this method to make it return a non-NULL service.
+  static void SetUseInTests();
+
  private:
   friend struct base::DefaultSingletonTraits<MediaRouterUIServiceFactory>;
 
   MediaRouterUIServiceFactory();
   ~MediaRouterUIServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory interface.
   content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
+  bool ServiceIsCreatedWithBrowserContext() const override;
+  bool ServiceIsNULLWhileTesting() const override;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterUIServiceFactory);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_UI_SERVICE_FACTORY_H_