Implement WEBGL_shared_resources

Source/core/html/canvas/WebGLContextAttributes.h

 /*
  * Copyright (c) 2010, 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 16 matching lines @@
 #ifndef WebGLContextAttributes_h
 #define WebGLContextAttributes_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/html/canvas/CanvasContextAttributes.h"
 #include "core/platform/graphics/GraphicsContext3D.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
+class WebGLShareGroup;
+
 class WebGLContextAttributes : public CanvasContextAttributes, public ScriptWrappable {
 public:
     virtual ~WebGLContextAttributes();
 
     // Create a new attributes object
     static PassRefPtr<WebGLContextAttributes> create();
 
     // Create a new attributes object initialized with preexisting attributes
     static PassRefPtr<WebGLContextAttributes> create(GraphicsContext3D::Attributes attributes);
 
@@ skipping 17 matching lines @@
     // though their alpha channel has already been multiplied into the
     // color channels; default=true
     bool premultipliedAlpha() const;
     void setPremultipliedAlpha(bool premultipliedAlpha);
 
     // Whether or not to preserve the drawing buffer after presentation to the
     // screen; default=false
     bool preserveDrawingBuffer() const;
     void setPreserveDrawingBuffer(bool);
 
+    // Which share group this context uses.
+    PassRefPtr<WebGLShareGroup> group() const;
+    void setGroup(PassRefPtr<WebGLShareGroup>);
+
     // Fetches a copy of the attributes stored in this object in a
     // form that can be used to initialize a GraphicsContext3D.
     GraphicsContext3D::Attributes attributes() const;
 
 protected:
     WebGLContextAttributes();
     WebGLContextAttributes(GraphicsContext3D::Attributes attributes);
 
 private:
     GraphicsContext3D::Attributes m_attrs;
+    RefPtr<WebGLShareGroup> m_shareGroup;
 };
 
 } // namespace WebCore
 
 #endif // WebGLContextAttributes_h