Introduce WebMediaSession

third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp

Index: third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp b/third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e4d9f460a1857b03dc1bee51a9d6db4db3603f4e
--- /dev/null
+++ b/third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp
@@ -0,0 +1,22 @@
+// 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 "config.h"
+#include "modules/mediasession/MediaSessionError.h"
+
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/ExceptionCode.h"
+#include "public/platform/modules/mediasession/WebMediaSessionError.h"
+
+namespace blink {
+
+// static
+DOMException* MediaSessionError::take(ScriptPromiseResolver*, const WebMediaSessionError& webError)
+{
+    ASSERT(webError == WebMediaSessionError::Activate);
+    return DOMException::create(InvalidStateError, "The media session activation failed.");
+}
+
+} // namespace blink