Provide user friendly messages for OTS parsing of fonts

Source/platform/fonts/FontCustomPlatformData.h

 /*
  * Copyright (C) 2007 Apple Computer, Inc.
  * Copyright (c) 2007, 2008, 2009, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 31 matching lines @@
 class SkTypeface;
 
 namespace blink {
 
 class FontPlatformData;
 class SharedBuffer;
 
 class PLATFORM_EXPORT FontCustomPlatformData {
     WTF_MAKE_NONCOPYABLE(FontCustomPlatformData);
 public:
-    static PassOwnPtr<FontCustomPlatformData> create(SharedBuffer*);
+    static PassOwnPtr<FontCustomPlatformData> create(SharedBuffer*, String& otsParseMessage);
     ~FontCustomPlatformData();
 
     FontPlatformData fontPlatformData(float size, bool bold, bool italic, FontOrientation = FontOrientation::Horizontal);
 
     static bool supportsFormat(const String&);
 
 private:
     explicit FontCustomPlatformData(PassRefPtr<SkTypeface>);
     RefPtr<SkTypeface> m_typeface;
 };
 
 } // namespace blink
 
 #endif // FontCustomPlatformData_h