Add MediaError.message

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

 // 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 "public/platform/WebMediaPlayer.h"
 
 #ifndef EmptyWebMediaPlayer_h
 #define EmptyWebMediaPlayer_h
 
 namespace blink {
@@ skipping 19 matching lines @@
                  WebSetSinkIdCallbacks*) override {}
   bool HasVideo() const override { return false; }
   bool HasAudio() const override { return false; }
   WebSize NaturalSize() const override;
   bool Paused() const override { return false; }
   bool Seeking() const override { return false; }
   double Duration() const override { return 0.0; }
   double CurrentTime() const override { return 0.0; }
   NetworkState GetNetworkState() const override { return kNetworkStateEmpty; }
   ReadyState GetReadyState() const override { return kReadyStateHaveNothing; }
-  WebString GetErrorMessage() override { return WebString(); }
+  WebString GetErrorMessage() const override;
   bool DidLoadingProgress() override { return false; }
   bool HasSingleSecurityOrigin() const override { return true; }
   bool DidPassCORSAccessCheck() const override { return true; }
   double MediaTimeForTimeValue(double time_value) const override {
     return time_value;
   };
   unsigned DecodedFrameCount() const override { return 0; }
   unsigned DroppedFrameCount() const override { return 0; }
   size_t AudioDecodedByteCount() const override { return 0; }
   size_t VideoDecodedByteCount() const override { return 0; }
   void Paint(WebCanvas*, const WebRect&, cc::PaintFlags&) override {}
 };
 
 }  // namespace blink
 
 #endif  // EmptyWebMediaPlayer_h