Split Gradient impl into separate classes

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

Index: third_party/WebKit/Source/modules/canvas2d/CanvasGradient.h
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasGradient.h b/third_party/WebKit/Source/modules/canvas2d/CanvasGradient.h
index fd18da9d6c139194e030a882e1718c34f4344aa6..dcdc75fd037ebb3bf7923553e7fdea907de91427 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasGradient.h
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasGradient.h
@@ -57,6 +57,8 @@ class MODULES_EXPORT CanvasGradient final
 
   void addColorStop(float value, const String& color, ExceptionState&);
 
+  bool isZeroSize() const { return m_isZeroSize; }
+
   DEFINE_INLINE_TRACE() {}
 
  private:
@@ -67,6 +69,7 @@ class MODULES_EXPORT CanvasGradient final
                  float r1);
 
   RefPtr<Gradient> m_gradient;
+  const bool m_isZeroSize;
 };
 
 }  // namespace blink