Add MediaError.message

third_party/WebKit/Source/platform/testing/EmptyWebMediaPlayer.cpp

 // Copyright 2017 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 "platform/testing/EmptyWebMediaPlayer.h"
 
 #include "public/platform/WebSize.h"
 #include "public/platform/WebTimeRange.h"
 
 namespace blink {
 
 WebTimeRanges EmptyWebMediaPlayer::Buffered() const {
   return WebTimeRanges();
 }
 
 WebTimeRanges EmptyWebMediaPlayer::Seekable() const {
   return WebTimeRanges();
 }
 
 WebSize EmptyWebMediaPlayer::NaturalSize() const {
   return WebSize(0, 0);
 }
 
+WebString EmptyWebMediaPlayer::GetErrorMessage() const {
+  return WebString();
+}
+
 }  // namespace blink