Implement wouldTaintOrigin and expose createPattern for OCRC2D on main thread

third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h

 /*
  * Copyright (C) 2009 Apple 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 101 matching lines @@
     virtual bool is3d() const { return false; }
     virtual void setFilterQuality(SkFilterQuality) { ASSERT_NOT_REACHED(); }
     virtual void reshape(int width, int height) { ASSERT_NOT_REACHED(); }
     virtual void markLayerComposited() { ASSERT_NOT_REACHED(); }
     virtual ImageData* paintRenderingResultsToImageData(SourceDrawingBuffer) { ASSERT_NOT_REACHED(); return nullptr; }
     virtual int externallyAllocatedBytesPerPixel() { ASSERT_NOT_REACHED(); return 0; }
 
     // ImageBitmap-specific interface
     virtual bool paint(GraphicsContext&, const IntRect&) { return false; }
 
-    bool wouldTaintOrigin(CanvasImageSource*);
+    bool wouldTaintOrigin(CanvasImageSource*, SecurityOrigin* = nullptr);
     void didMoveToNewDocument(Document*);
 
     // OffscreenCanvas-specific methods
     OffscreenCanvas* getOffscreenCanvas() const { return m_offscreenCanvas; }
     virtual ImageBitmap* transferToImageBitmap(ExceptionState&) { return nullptr; }
 
 protected:
     CanvasRenderingContext(HTMLCanvasElement* = nullptr, OffscreenCanvas* = nullptr);
     DECLARE_VIRTUAL_TRACE();
     virtual void stop() = 0;
 
 private:
     Member<HTMLCanvasElement> m_canvas;
     Member<OffscreenCanvas> m_offscreenCanvas;
     HashSet<String> m_cleanURLs;
     HashSet<String> m_dirtyURLs;
 };
 
 } // namespace blink
 
 #endif