[Media Router] Conditionally enable mDNS on Windows.

chrome/browser/media/android/router/media_router_android.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_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_
 #define CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 47 matching lines @@
   void TerminateRoute(const MediaRoute::Id& route_id) override;
   void SendRouteMessage(const MediaRoute::Id& route_id,
                         const std::string& message,
                         const SendRouteMessageCallback& callback) override;
   void SendRouteBinaryMessage(
       const MediaRoute::Id& route_id,
       scoped_ptr<std::vector<uint8_t>> data,
       const SendRouteMessageCallback& callback) override;
   void AddIssue(const Issue& issue) override;
   void ClearIssue(const Issue::Id& issue_id) override;
 

[apacible, 2016/03/23 22:04:45]

nit: remove extra line here so it's obvious these two functions are from the
MediaRouter implementation.

[btolsch, 2016/03/24 01:44:03]

Done.

+  bool is_mdns_discovery_enabled() const override;
+  void EnableMdnsDiscovery() override;
+
   // The methods called by the Java counterpart.
 
   // Notifies the media router that information about sinks is received for
   // a specific source URN.
   void OnSinksReceived(JNIEnv* env,
                        const base::android::JavaParamRef<jobject>& obj,
                        const base::android::JavaParamRef<jstring>& jsource_urn,
                        jint jcount);
 
   // Notifies the media router about a successful route creation.
@@ skipping 82 matching lines @@
       MediaRoute::Id,
       scoped_ptr<base::ObserverList<PresentationSessionMessagesObserver>>>;
   MessagesObservers messages_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterAndroid);
 };
 
 } // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_