Add support for [NoInterfaceObject] extended attribute to bindings generator

Source/core/html/canvas/EXTDrawBuffers.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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 typedef unsigned long GLenum;
 
 [
+    NoInterfaceObject,
     Conditional=WEBGL,
     DoNotCheckConstants
 ] interface EXTDrawBuffers {
     const GLenum COLOR_ATTACHMENT0_EXT = 0x8CE0;
     const GLenum COLOR_ATTACHMENT1_EXT = 0x8CE1;
     const GLenum COLOR_ATTACHMENT2_EXT = 0x8CE2;
     const GLenum COLOR_ATTACHMENT3_EXT = 0x8CE3;
     const GLenum COLOR_ATTACHMENT4_EXT = 0x8CE4;
     const GLenum COLOR_ATTACHMENT5_EXT = 0x8CE5;
     const GLenum COLOR_ATTACHMENT6_EXT = 0x8CE6;
@@ skipping 22 matching lines @@
     const GLenum DRAW_BUFFER12_EXT = 0x8831;
     const GLenum DRAW_BUFFER13_EXT = 0x8832;
     const GLenum DRAW_BUFFER14_EXT = 0x8833;
     const GLenum DRAW_BUFFER15_EXT = 0x8834;
 
     const GLenum MAX_COLOR_ATTACHMENTS_EXT = 0x8CDF;
     const GLenum MAX_DRAW_BUFFERS_EXT = 0x8824;
 
     void drawBuffersEXT(sequence<GLenum> buffers);
 };