Split Gradient impl into separate classes

third_party/WebKit/Source/modules/canvas2d/CanvasGradient.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 39 matching lines @@
                                 float r0,
                                 const FloatPoint& p1,
                                 float r1) {
     return new CanvasGradient(p0, r0, p1, r1);
   }
 
   Gradient* getGradient() const { return m_gradient.get(); }
 
   void addColorStop(float value, const String& color, ExceptionState&);
 
+  bool isZeroSize() const { return m_isZeroSize; }
+
   DEFINE_INLINE_TRACE() {}
 
  private:
   CanvasGradient(const FloatPoint& p0, const FloatPoint& p1);
   CanvasGradient(const FloatPoint& p0,
                  float r0,
                  const FloatPoint& p1,
                  float r1);
 
   RefPtr<Gradient> m_gradient;
+  const bool m_isZeroSize;
 };
 
 }  // namespace blink
 
 #endif  // CanvasGradient_h