Introduce WebMediaSession

content/renderer/media/android/webmediasession_android.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 "content/renderer/media/android/webmediasession_android.h"
+
+namespace content {
+
+void WebMediaSessionAndroid::activate(
+    blink::WebMediaSessionCommandCallback* callback) {
+  NOTIMPLEMENTED();
+
+  callback->onError(blink::WebMediaSessionError::ErrorTypeActivate);
+  delete callback;
+}
+
+void WebMediaSessionAndroid::deactivate(
+    blink::WebMediaSessionCommandCallback* callback) {
+  NOTIMPLEMENTED();
+
+  callback->onSuccess();
+  delete callback;
+}
+
+}  // namespace content