mash: Change the MediaDelegate to a Media{Controller,Client}.

ash/common/media_controller.cc

Index: ash/common/media_controller.cc
diff --git a/ash/common/media_controller.cc b/ash/common/media_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7a72fe4b0fc82a37e0deb1b371c057de099c3214
--- /dev/null
+++ b/ash/common/media_controller.cc
@@ -0,0 +1,55 @@
+// Copyright 2016 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 "ash/common/media_controller.h"
+
+namespace ash {
+
+MediaController::MediaController() {}
+
+MediaController::~MediaController() {}
+
+void MediaController::BindRequest(mojom::MediaControllerRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+void MediaController::AddObserver(MediaCaptureObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void MediaController::RemoveObserver(MediaCaptureObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void MediaController::HandleMediaNextTrack() {
+  if (client_)
+    client_->HandleMediaNextTrack();
+}
+
+void MediaController::HandleMediaPlayPause() {
+  if (client_)
+    client_->HandleMediaPlayPause();
+}
+
+void MediaController::HandleMediaPrevTrack() {
+  if (client_)
+    client_->HandleMediaPrevTrack();
+}
+
+void MediaController::RequestCaptureState() {
+  if (client_)
+    client_->RequestCaptureState();
+}
+
+void MediaController::SetClient(mojom::MediaClientAssociatedPtrInfo client) {
+  client_.Bind(std::move(client));
+}
+
+void MediaController::NotifyCaptureState(
+    const std::vector<mojom::MediaCaptureState>& capture_states) {
+  for (auto& observer : observers_)
+    observer.OnMediaCaptureChanged(capture_states);
+}
+
+}  // namespace ash