Add MediaError.message

content/renderer/media/webmediaplayer_ms.h

 // Copyright 2013 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 CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_
 #define CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 112 matching lines @@
   // Getters of playback state.
   bool Paused() const override;
   bool Seeking() const override;
   double Duration() const override;
   double CurrentTime() const override;
 
   // Internal states of loading and network.
   blink::WebMediaPlayer::NetworkState GetNetworkState() const override;
   blink::WebMediaPlayer::ReadyState GetReadyState() const override;
 
-  blink::WebString GetErrorMessage() override;
+  blink::WebString GetErrorMessage() const override;
   bool DidLoadingProgress() override;
 
   bool HasSingleSecurityOrigin() const override;
   bool DidPassCORSAccessCheck() const override;
 
   double MediaTimeForTimeValue(double timeValue) const override;
 
   unsigned DecodedFrameCount() const override;
   unsigned DroppedFrameCount() const override;
   size_t AudioDecodedByteCount() const override;
@@ skipping 117 matching lines @@
   // True if playback should be started upon the next call to OnShown(). Only
   // used on Android.
   bool should_play_upon_shown_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerMS);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_