Introduce WebMediaSession

third_party/WebKit/public/platform/modules/mediasession/WebMediaSessionError.h

Index: third_party/WebKit/public/platform/modules/mediasession/WebMediaSessionError.h
diff --git a/third_party/WebKit/public/platform/modules/mediasession/WebMediaSessionError.h b/third_party/WebKit/public/platform/modules/mediasession/WebMediaSessionError.h
new file mode 100644
index 0000000000000000000000000000000000000000..d18496ed1ec0f28c599d37b12042307f57e4e45c
--- /dev/null
+++ b/third_party/WebKit/public/platform/modules/mediasession/WebMediaSessionError.h
@@ -0,0 +1,17 @@
+// 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.
+
+#ifndef WebMediaSessionError_h
+#define WebMediaSessionError_h
+
+namespace blink {
+
+enum class WebMediaSessionError {
+    Activate = 0,
+    Last = Activate
+};
+
+} // namespace blink
+
+#endif // WebMediaSessionError_h