This CL implements the first draft of Canvas 2D Context Attributes, aka getContext('2d', { alpha: f…

Source/core/html/canvas/CanvasRenderingContext2D.idl

 /*
  * Copyright (C) 2006 Apple Computer, 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 198 matching lines @@
     // pixel manipulation
     [RaisesException] ImageData getImageData([Default=Undefined] optional float sx, [Default=Undefined] optional float sy,
                            [Default=Undefined] optional float sw, [Default=Undefined] optional float sh);
 
     [RaisesException] ImageData webkitGetImageDataHD([Default=Undefined] optional float sx, [Default=Undefined] optional float sy,
                                    [Default=Undefined] optional float sw, [Default=Undefined] optional float sh);
 
     readonly attribute float webkitBackingStorePixelRatio;
 
     attribute boolean webkitImageSmoothingEnabled;
+
+    [EnabledAtRuntime=experimentalCanvasFeatures] Canvas2DContextAttributes getContextAttributes();
 };