Merge the Sky Engine changes from the SkyDart branch

sky/engine/core/html/canvas/WebGLDrawBuffers.idl

 /*
  * Copyright (C) 2013 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:
  *
  * 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
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 typedef unsigned long GLenum;
 
 [
     NoInterfaceObject,
-    DoNotCheckConstants,
 ] interface WebGLDrawBuffers {
     const GLenum COLOR_ATTACHMENT0_WEBGL = 0x8CE0;
     const GLenum COLOR_ATTACHMENT1_WEBGL = 0x8CE1;
     const GLenum COLOR_ATTACHMENT2_WEBGL = 0x8CE2;
     const GLenum COLOR_ATTACHMENT3_WEBGL = 0x8CE3;
     const GLenum COLOR_ATTACHMENT4_WEBGL = 0x8CE4;
     const GLenum COLOR_ATTACHMENT5_WEBGL = 0x8CE5;
     const GLenum COLOR_ATTACHMENT6_WEBGL = 0x8CE6;
     const GLenum COLOR_ATTACHMENT7_WEBGL = 0x8CE7;
     const GLenum COLOR_ATTACHMENT8_WEBGL = 0x8CE8;
@@ skipping 20 matching lines @@
     const GLenum DRAW_BUFFER12_WEBGL = 0x8831;
     const GLenum DRAW_BUFFER13_WEBGL = 0x8832;
     const GLenum DRAW_BUFFER14_WEBGL = 0x8833;
     const GLenum DRAW_BUFFER15_WEBGL = 0x8834;
 
     const GLenum MAX_COLOR_ATTACHMENTS_WEBGL = 0x8CDF;
     const GLenum MAX_DRAW_BUFFERS_WEBGL = 0x8824;
 
     void drawBuffersWEBGL(sequence<GLenum> buffers);
 };