Use code generator's argument processing in custom WebGL methods

Source/core/html/canvas/WebGLRenderingContextBase.idl

 /*
  * Copyright (C) 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 557 matching lines @@
     DOMString?   getShaderInfoLog(WebGLShader? shader);
 
     WebGLShaderPrecisionFormat getShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype);
 
     DOMString?   getShaderSource(WebGLShader? shader);
 
     sequence<DOMString>? getSupportedExtensions();
 
     [Custom] any getTexParameter(GLenum target, GLenum pname);
 
-    [Custom] any getUniform(WebGLProgram? program, WebGLUniformLocation location);
+    [Custom] any getUniform(WebGLProgram? program, WebGLUniformLocation? location);

[Jens Widell, 2014/07/11 12:24:30]

The location argument is nullable in the specification and was in our
implementation too. Change needed to get the right argument processing from the
code generator, and makes sense.

 
     WebGLUniformLocation getUniformLocation(WebGLProgram? program, DOMString name);
 
     [Custom] any getVertexAttrib(GLuint index, GLenum pname);
 
     GLsizeiptr getVertexAttribOffset(GLuint index, GLenum pname);
 
     void hint(GLenum target, GLenum mode);
     GLboolean isBuffer(WebGLBuffer? buffer);
     GLboolean isContextLost();
@@ skipping 91 matching lines @@
     [Custom] void vertexAttrib2fv(GLuint indx, Float32Array values);
     void vertexAttrib3f(GLuint indx, GLfloat x, GLfloat y, GLfloat z);
     [Custom] void vertexAttrib3fv(GLuint indx, Float32Array values);
     void vertexAttrib4f(GLuint indx, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
     [Custom] void vertexAttrib4fv(GLuint indx, Float32Array values);
     void vertexAttribPointer(GLuint indx, GLint size, GLenum type, GLboolean normalized,
                              GLsizei stride, GLintptr offset);
 
     void viewport(GLint x, GLint y, GLsizei width, GLsizei height);
 };