Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/html/canvas/OESTextureHalfFloat.idl

 /*
  * Copyright (C) 2013 Motorola Mobility LLC. 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
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 typedef unsigned long GLenum;
 
 [
     NoInterfaceObject,
-    DoNotCheckConstants
+    DoNotCheckConstants,
+    WillBeGarbageCollected,
 ] interface OESTextureHalfFloat {
     const GLenum HALF_FLOAT_OES                 = 0x8D61;
 };