[Media Router] Custom Controls 3 - add plumbing through MRUI and MRWebUIMessageHandler

chrome/browser/media/router/mojo/media_route_controller.cc

 // Copyright 2017 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/mojo/media_route_controller.h"
 
 #include <utility>
 
 #include "chrome/browser/media/router/media_router.h"
 
@@ skipping 24 matching lines @@
     : route_id_(route_id),
       mojo_media_controller_(std::move(mojo_media_controller)),
       media_router_(media_router),
       binding_(this) {
   DCHECK(mojo_media_controller_.is_bound());
   DCHECK(media_router);
   mojo_media_controller_.set_connection_error_handler(base::Bind(
       &MediaRouteController::OnMojoConnectionError, base::Unretained(this)));
 }
 
-void MediaRouteController::Play() {
+void MediaRouteController::Play() const {
   DCHECK(is_valid_);
   mojo_media_controller_->Play();
 }
 
-void MediaRouteController::Pause() {
+void MediaRouteController::Pause() const {
   DCHECK(is_valid_);
   mojo_media_controller_->Pause();
 }
 
-void MediaRouteController::Seek(base::TimeDelta time) {
+void MediaRouteController::Seek(base::TimeDelta time) const {
   DCHECK(is_valid_);
   mojo_media_controller_->Seek(time);
 }
 
-void MediaRouteController::SetMute(bool mute) {
+void MediaRouteController::SetMute(bool mute) const {
   DCHECK(is_valid_);
   mojo_media_controller_->SetMute(mute);
 }
 
-void MediaRouteController::SetVolume(float volume) {
+void MediaRouteController::SetVolume(float volume) const {
   DCHECK(is_valid_);
   mojo_media_controller_->SetVolume(volume);
 }
 
 void MediaRouteController::OnMediaStatusUpdated(const MediaStatus& status) {
   DCHECK(is_valid_);
   for (Observer& observer : observers_)
     observer.OnMediaStatusUpdated(status);
 }
 
@@ skipping 31 matching lines @@
   DCHECK(is_valid_);
   observers_.RemoveObserver(observer);
 }
 
 void MediaRouteController::OnMojoConnectionError() {
   media_router_->DetachRouteController(route_id_, this);
   Invalidate();
 }
 
 }  // namespace media_router