Add MediaError.message

media/blink/webmediaplayer_impl.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 MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 140 matching lines @@
   double Duration() const override;
   virtual double timelineOffset() const;
   double CurrentTime() const override;
 
   // Internal states of loading and network.
   // TODO(hclam): Ask the pipeline about the state rather than having reading
   // them from members which would cause race conditions.
   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 552 matching lines @@
   base::CancelableCallback<void(base::TimeTicks)> frame_time_report_cb_;
 
   bool initial_video_height_recorded_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_