Fixing type error for WebGL's getShaderParameter.

sdk/lib/web_gl/dart2js/web_gl_dart2js.dart

 library dart.dom.web_gl;
 
 import 'dart:collection';
 import 'dart:_collection-dev';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:typed_data';
 import 'dart:_js_helper' show Creates, JSName, Null, Returns, convertDartClosureToJS;
 import 'dart:_foreign_helper' show JS;
 import 'dart:_interceptors' show Interceptor, JSExtendableArray;
@@ skipping 2333 matching lines @@
   @Creates('int|Null')
   @Returns('int|Null')
   Object getRenderbufferParameter(int target, int pname) native;
 
   @DomName('WebGLRenderingContext.getShaderInfoLog')
   @DocsEditable
   String getShaderInfoLog(Shader shader) native;
 
   @DomName('WebGLRenderingContext.getShaderParameter')
   @DocsEditable
-  @Creates('int|Null')
-  @Returns('int|Null')
+  @Creates('int|bool|Null')
+  @Returns('int|bool|Null')
   Object getShaderParameter(Shader shader, int pname) native;
 
   @DomName('WebGLRenderingContext.getShaderPrecisionFormat')
   @DocsEditable
   ShaderPrecisionFormat getShaderPrecisionFormat(int shadertype, int precisiontype) native;
 
   @DomName('WebGLRenderingContext.getShaderSource')
   @DocsEditable
   String getShaderSource(Shader shader) native;
 
@@ skipping 401 matching lines @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('WebGLVertexArrayObjectOES')
 // http://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
 @Experimental // experimental
 class VertexArrayObject native "WebGLVertexArrayObjectOES" {
 }