Fixing up previous CL to fix Dartium issues.

sdk/lib/web_gl/dart2js/web_gl_dart2js.dart

Index: sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
diff --git a/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart b/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
index 1cad109985de1f1f282bc0b9d896b8e872a3bce6..c70749f316142b2def8838347c09367a99cba7aa 100644
--- a/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
+++ b/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
@@ -669,6 +669,12 @@ class ExtDrawBuffers native "EXTDrawBuffers" {
   @DomName('EXTDrawBuffers.MAX_DRAW_BUFFERS_EXT')
   @DocsEditable
   static const int MAX_DRAW_BUFFERS_EXT = 0x8824;
+
+  @JSName('drawBuffersEXT')
+  @DomName('EXTDrawBuffers.drawBuffersEXT')
+  @DocsEditable
+  @Experimental // untriaged
+  void drawBuffersExt(List<int> buffers) native;
 }
 // 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