Introduce WebMediaSession

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

+// 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 {
+
+struct WebMediaSessionError {
+    enum ErrorType {

[mlamouri (slow - plz ping), 2015/10/07 14:19:31]

I think it would be beneficial to move this outside of the struct and make it a
"class enum". Two benefits are that you will then be able to do:
  blink::WebMediaSessionErrorType::Activate;
instead of:
  blink::WebMediaSessionError::ErrorTypeActivate;

Also, that will allow you to forward declare the enum (and the struct) instead
of including the header when you only need the enum.

[davve, 2015/10/08 09:17:35]

Good point. Seems like I only need the enum really so I'll just ditch the
struct.

+        ErrorTypeActivate = 0,
+        ErrorTypeLast = ErrorTypeActivate
+    };
+
+    WebMediaSessionError(ErrorType errorType)
+        : errorType(errorType)
+    {
+    }
+
+    ErrorType errorType;
+};
+
+} // namespace blink
+
+#endif // WebMediaSessionError_h