(Not for review) Dummy C++ side Custom Controls implementation

chrome/browser/media/router/media_router_base.cc

 // 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.
 
 #include "chrome/browser/media/router/media_router_base.h"
 
 #include "base/bind.h"
 #include "base/guid.h"
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
@@ skipping 58 matching lines @@
 
 void MediaRouterBase::OnIncognitoProfileShutdown() {
   for (const auto& route_id : internal_routes_observer_->incognito_route_ids)
     TerminateRoute(route_id);
 }
 
 std::vector<MediaRoute> MediaRouterBase::GetCurrentRoutes() const {
   return internal_routes_observer_->current_routes;
 }
 
+MediaRouteController* MediaRouterBase::GetControllerForRoute(
+    const MediaRoute::Id& route_id) {
+  return nullptr;
+}
+
 MediaRouterBase::MediaRouterBase() : initialized_(false) {}
 
 // static
 std::string MediaRouterBase::CreatePresentationId() {
   return "mr_" + base::GenerateGUID();
 }
 
 void MediaRouterBase::NotifyPresentationConnectionStateChange(
     const MediaRoute::Id& route_id,
     content::PresentationConnectionState state) {
@@ skipping 43 matching lines @@
   }
 }
 
 void MediaRouterBase::Shutdown() {
   // The observer calls virtual methods on MediaRouter; it must be destroyed
   // outside of the dtor
   internal_routes_observer_.reset();
 }
 
 }  // namespace media_router