[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/discovery/dial/dial_registry.h

 // Copyright (c) 2012 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_DISCOVERY_DIAL_DIAL_REGISTRY_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DIAL_REGISTRY_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 45 matching lines @@
 
   static DialRegistry* GetInstance();
 
   // Called by the DIAL API when event listeners are added or removed. The dial
   // service is started after the first listener is added and stopped after the
   // last listener is removed.
   void OnListenerAdded();
   void OnListenerRemoved();
 
   // pass a reference of |observer| to allow it to notify on DIAL device events.
-  // This class does not take ownership of |observer|.
-  void RegisterObserver(Observer* observer);
-  void UnregisterObserver(Observer* observer);
+  // This class does not take ownership of observer.
+  virtual void RegisterObserver(Observer* observer);
+  virtual void UnregisterObserver(Observer* observer);
 
   // Called by the DIAL API to try to kickoff a discovery if there is not one
   // already active.
   bool DiscoverNow();
 
   // Starts and stops periodic discovery.  Periodic discovery is done when there
   // are registered event listeners.
   void StartPeriodicDiscovery();
   void StopPeriodicDiscovery();
 
@@ skipping 16 matching lines @@
 
   // The DIAL service. Periodic discovery is active when this is not NULL.
   std::unique_ptr<DialService> dial_;
 
  private:
   using DeviceByIdMap =
       base::hash_map<std::string, std::unique_ptr<DialDeviceData>>;
   using DeviceByLabelMap = std::map<std::string, DialDeviceData*>;
 
   friend class MockDialRegistry;
+  friend class TestDialRegistry;
   friend struct base::DefaultSingletonTraits<DialRegistry>;
 
   DialRegistry();
   ~DialRegistry() override;
 
   // DialService::Observer:
   void OnDiscoveryRequest(DialService* service) override;
   void OnDeviceDiscovered(DialService* service,
                           const DialDeviceData& device) override;
   void OnDiscoveryFinished(DialService* service) override;
@@ skipping 85 matching lines @@
                            TestRemovingListenerDoesNotClearList);
   FRIEND_TEST_ALL_PREFIXES(DialRegistryTest, TestNetworkEventConnectionLost);
   FRIEND_TEST_ALL_PREFIXES(DialRegistryTest,
                            TestNetworkEventConnectionRestored);
   DISALLOW_COPY_AND_ASSIGN(DialRegistry);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DIAL_REGISTRY_H_