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 {
+
+WebMediaSessionAndroid::WebMediaSessionAndroid() {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+}
+
+WebMediaSessionAndroid::~WebMediaSessionAndroid() {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+}
+
+void WebMediaSessionAndroid::activate(
+    blink::WebMediaSessionCommandCallback* callback) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+
+  delete callback;
+  NOTREACHED();

[mlamouri (slow - plz ping), 2015/09/28 15:16:02]

Could you resolve the callback and add a NOT_IMPLEMENTED() call here?
NOTREACHED() will crash and the callback will never be called. It seems
unnecessary.

[davve, 2015/10/06 12:05:13]

Done. I'll let the activate promise fail.

+}
+
+void WebMediaSessionAndroid::deactivate(
+    blink::WebMediaSessionCommandCallback* callback) {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+
+  delete callback;
+  NOTREACHED();

[mlamouri (slow - plz ping), 2015/09/28 15:16:02]

ditto

[davve, 2015/10/06 12:05:13]

Done. Since activate can't succeed I'll make deactivate instantly succeed.

+}
+
+}  // namespace content