Convert colorSettings attribute in ImageData.idl to a getter method

third_party/WebKit/Source/core/html/ImageData.idl

 /*
  * Copyright (C) 2008, 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
@@ skipping 29 matching lines @@
 
     // The following createImageData functions are used instead of the regular constructors
     // as currently Blink IDL does not allow to put custom constructors behind a flag
     // (crbug.com/672978). These must be replaced with regular constructor declaration
     // as specified in the proposal before shipping.
     // https://github.com/WICG/canvas-color-space/blob/master/CanvasColorSpaceProposal.md
 
     [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] ImageData createImageData(unsigned long sw, unsigned long sh, ImageDataColorSettings imageDataColorSettings);
     [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] ImageData createImageData(ImageDataArray data, unsigned long sw, unsigned long sh, ImageDataColorSettings imageDataColorSettings);
 
+    [RuntimeEnabled=ExperimentalCanvasFeatures] ImageDataColorSettings getColorSettings();
+
     readonly attribute unsigned long width;
     readonly attribute unsigned long height;
     readonly attribute Uint8ClampedArray data;
     [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute ImageDataArray dataUnion;
-    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute ImageDataColorSettings colorSettings;
 };