Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/webgl/CHROMIUMSubscribeUniform.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 typedef unsigned long GLenum;
 
 [
     DoNotCheckConstants,
     NoInterfaceObject,
-    TypeChecking=Interface,
-    WillBeGarbageCollected,
+    GarbageCollected,
     SetWrapperReferenceFrom=canvas,
 ] interface CHROMIUMSubscribeUniform {
     const GLenum SUBSCRIBED_VALUES_BUFFER_CHROMIUM =      0x924B;
 
     const GLenum MOUSE_POSITION_CHROMIUM =                0x924C;
 
     CHROMIUMValuebuffer createValuebufferCHROMIUM();
     void deleteValuebufferCHROMIUM(CHROMIUMValuebuffer? buffer);
     boolean isValuebufferCHROMIUM(CHROMIUMValuebuffer? buffer);
     void bindValuebufferCHROMIUM(GLenum target, CHROMIUMValuebuffer? buffer);
 
     void subscribeValueCHROMIUM(GLenum target, GLenum subscriptions);
     void populateSubscribedValuesCHROMIUM(GLenum target);
     void uniformValuebufferCHROMIUM(WebGLUniformLocation? location, GLenum target, GLenum subscription);
 };