Update test status for webgl extension tests, fix one typo in extension name

sdk/lib/web_gl/dart2js/web_gl_dart2js.dart

 /**
  * 3D programming in the browser.
  */
 library dart.dom.web_gl;
 
 import 'dart:collection';
 import 'dart:_internal';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:_native_typed_data';
@@ skipping 829 matching lines @@
   static const int SRGB_EXT = 0x8C40;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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('EXTBlendMinMax')
 @Experimental() // untriaged
-@Native("EXTBlendMinMax,EXT_blend_min_max")
+@Native("EXTBlendMinMax,EXT_blend_minmax")
 class ExtBlendMinMax extends Interceptor {
   // To suppress missing implicit constructor warnings.
   factory ExtBlendMinMax._() { throw new UnsupportedError("Not supported"); }
 
   @DomName('EXTBlendMinMax.MAX_EXT')
   @DocsEditable()
   @Experimental() // untriaged
   static const int MAX_EXT = 0x8008;
 
   @DomName('EXTBlendMinMax.MIN_EXT')
@@ skipping 5152 matching lines @@
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable()
 @DomName('WebGLRenderingContextBase')
 @Experimental() // untriaged
 abstract class _WebGLRenderingContextBase extends Interceptor {
   // To suppress missing implicit constructor warnings.
   factory _WebGLRenderingContextBase._() { throw new UnsupportedError("Not supported"); }
 }