[Blink>MediaSession] Use setActionCallback() instead of event listeners for media control actions

third_party/WebKit/Source/bindings/modules/v8/custom/V8MediaSessionCustom.cpp

Index: third_party/WebKit/Source/bindings/modules/v8/custom/V8MediaSessionCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/modules/v8/custom/V8MediaSessionCustom.cpp b/third_party/WebKit/Source/bindings/modules/v8/custom/V8MediaSessionCustom.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f89dc016bfe15d17c1ddfd4b69abfb942a6d48ac
--- /dev/null
+++ b/third_party/WebKit/Source/bindings/modules/v8/custom/V8MediaSessionCustom.cpp
@@ -0,0 +1,20 @@
+// 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 "bindings/modules/v8/V8MediaSession.h"
+
+#include "bindings/core/v8/V8DOMWrapper.h"
+#include "modules/mediasession/MediaSession.h"
+
+namespace blink {
+
+void V8MediaSession::visitDOMWrapperCustom(
+    v8::Isolate* isolate,
+    ScriptWrappable* scriptWrappable,
+    const v8::Persistent<v8::Object>& wrapper) {
+  MediaSession* mediaSession = scriptWrappable->toImpl<MediaSession>();
+  mediaSession->setV8ReferencesForCallbacks(isolate, wrapper);

[mlamouri (slow - plz ping), 2016/12/20 13:25:57]

nit: you can probably do this in one line.

[Zhiqiang Zhang (Slow), 2016/12/20 13:53:06]

Done.

+}
+
+}  // namespace blink