[Media Router] Add a presentation id to MediaRoute mapping in the MR

chrome/browser/media/router/media_router_base.h

Index: chrome/browser/media/router/media_router_base.h
diff --git a/chrome/browser/media/router/media_router_base.h b/chrome/browser/media/router/media_router_base.h
index e2710031b7627726cd609027c47c3cd1865a6082..c56943cc78c99674f4ae1bb1d5427c6d997b70ee 100644
--- a/chrome/browser/media/router/media_router_base.h
+++ b/chrome/browser/media/router/media_router_base.h
@@ -34,6 +34,12 @@ class MediaRouterBase : public MediaRouter {
 
   std::vector<MediaRoute> GetCurrentRoutes() const override;
 
+  const MediaRoute* GetPresentationRoute(
+      const std::string& presentation_id) const override;
+
+  void SetPresentationId(const MediaRoute::Id& route_id,
+                         const std::string& presentation_id) override;
+
  protected:
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoImplTest,
                            PresentationConnectionStateChangedCallback);