Add ImageBitmapRenderingContext (experimental)

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 41 matching lines @@
     // A Canvas can either be "2D" or "webgl" but never both. If you request a 2D canvas and the existing
     // context is already 2D, just return that. If the existing context is WebGL, then destroy it
     // before creating a new 2D context. Vice versa when requesting a WebGL canvas. Requesting a
     // context with any other type string will destroy any existing context.
     enum ContextType {
         // Do not change assigned numbers of existing items: add new features to the end of the list.
         Context2d = 0,
         ContextExperimentalWebgl = 2,
         ContextWebgl = 3,
         ContextWebgl2 = 4,
+        ContextImageBitmap = 5,
         ContextTypeCount,
     };
 
     static ContextType contextTypeFromId(const String& id);
     static ContextType resolveContextTypeAliases(ContextType);
 
 #if !ENABLE(OILPAN)
     void ref() { m_canvas->ref(); }
     void deref() { m_canvas->deref(); }
 #endif
@@ skipping 37 matching lines @@
     virtual void styleDidChange(const ComputedStyle* oldStyle, const ComputedStyle& newStyle) { }
 
     // WebGL-specific interface
     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*);
     void didMoveToNewDocument(Document*);
 
 protected:
     CanvasRenderingContext(HTMLCanvasElement*);
     DECLARE_VIRTUAL_TRACE();
 
     virtual void stop() = 0;
 
 private:
     RawPtrWillBeMember<HTMLCanvasElement> m_canvas;
     HashSet<String> m_cleanURLs;
     HashSet<String> m_dirtyURLs;
 };
 
 } // namespace blink
 
 #endif