Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/GraphicsContextState.h

 // Copyright (C) 2013 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.
 //    * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
@@ skipping 63 matching lines @@
     void setStrokeStyle(StrokeStyle);
 
     void setStrokeThickness(float);
 
     SkColor effectiveStrokeColor() const { return applyAlpha(m_strokeData.color().rgb()); }
     void setStrokeColor(const Color&);
 
     void setStrokeGradient(const PassRefPtr<Gradient>);
     void clearStrokeGradient();
 
-    void setStrokePattern(const PassRefPtr<Pattern>);
+    void setStrokePattern(const PassRefPtr<Pattern>, SkShader::ShaderLocation preferredLocation);
     void clearStrokePattern();
 
     void setLineCap(LineCap);
 
     void setLineJoin(LineJoin);
 
     void setMiterLimit(float);
 
     void setLineDash(const DashArray&, float);
 
     // Fill data
     Color fillColor() const { return m_fillColor; }
     SkColor effectiveFillColor() const { return applyAlpha(m_fillColor.rgb()); }
     void setFillColor(const Color&);
 
     Gradient* fillGradient() const { return m_fillGradient.get(); }
     void setFillGradient(const PassRefPtr<Gradient>);
     void clearFillGradient();
 
     Pattern* fillPattern() const { return m_fillPattern.get(); }
-    void setFillPattern(const PassRefPtr<Pattern>);
+    void setFillPattern(const PassRefPtr<Pattern>, SkShader::ShaderLocation preferredLocation);
     void clearFillPattern();
 
     // Path fill rule
     WindRule fillRule() const { return m_fillRule; }
     void setFillRule(WindRule rule) { m_fillRule = rule; }
 
     // Shadow. (This will need tweaking if we use draw loopers for other things.)
     SkDrawLooper* drawLooper() const { return m_looper.get(); }
     void setDrawLooper(PassRefPtr<SkDrawLooper>);
     void clearDrawLooper();
@@ skipping 68 matching lines @@
     uint16_t m_saveCount;
 
     bool m_shouldAntialias : 1;
     bool m_shouldSmoothFonts : 1;
     bool m_shouldClampToSourceRect : 1;
 };
 
 } // namespace blink
 
 #endif // GraphicsContextState_h