Add Media Router Mojo impl code.

chrome/browser/media/router/media_router_impl.h

Index: chrome/browser/media/router/media_router_impl.h
diff --git a/chrome/browser/media/router/media_router_impl.h b/chrome/browser/media/router/media_router_impl.h
index dece32c23241c72637c88eb97ce873593a195df9..bca2a211773ad4a085b2058a2f471f1fe28bbcfe 100644
--- a/chrome/browser/media/router/media_router_impl.h
+++ b/chrome/browser/media/router/media_router_impl.h
@@ -49,12 +49,13 @@ class MediaRouterImpl : public MediaRouter, public KeyedService {
   void Initialize(MediaRouter* provider_manager_host);
 
   // MediaRouter implementation.
-  void RequestRoute(const MediaSourceId& source,
-                    const MediaSinkId& sink_id,
-                    const MediaRouteResponseCallback& callback) override;
+  void CreateRoute(const MediaSourceId& source,
+                   const MediaSinkId& sink_id,
+                   const MediaRouteResponseCallback& callback) override;
   void CloseRoute(const MediaRouteId& route_id) override;
   void PostMessage(const MediaRouteId& route_id,
                    const std::string& message) override;
+  void ClearIssue(const std::string& issue_id) override;
 
  private:
   friend class MediaRouterImplFactory;
@@ -67,6 +68,8 @@ class MediaRouterImpl : public MediaRouter, public KeyedService {
   void UnregisterMediaSinksObserver(MediaSinksObserver* observer) override;
   bool RegisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void UnregisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
+  void AddIssuesObserver(IssuesObserver* observer) override;
+  void RemoveIssuesObserver(IssuesObserver* observer) override;
 
   // MRPM host to forward calls to MRPM to.
   // This class does not own provider_manager_host_.