Add an optional argument to HTMLCanvasElement.toDataURL.

lib/dom/dart2js/dom_dart2js.dart

 #library('dart:dom_deprecated');
 
 // Copyright (c) 2011, 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.
 
 // DO NOT EDIT
 // Auto-generated Dart DOM library.
 
 
@@ skipping 2803 matching lines @@
 }
 
 class _HTMLCanvasElementJs extends _HTMLElementJs implements HTMLCanvasElement native "*HTMLCanvasElement" {
 
   int height;
 
   int width;
 
   Object getContext(String contextId) native;
 
-  String toDataURL(String type) native;
+  String toDataURL(String type, [num quality]) native;
 }
 
 class _HTMLCollectionJs extends _DOMTypeJs implements HTMLCollection native "*HTMLCollection" {
 
   final int length;
 
   _NodeJs operator[](int index) native "return this[index];";
 
   void operator[]=(int index, _NodeJs value) {
     throw new UnsupportedOperationException("Cannot assign element of immutable List.");
@@ skipping 12697 matching lines @@
 // WARNING: Do not edit - generated code.
 
 interface HTMLCanvasElement extends HTMLElement {
 
   int height;
 
   int width;
 
   Object getContext(String contextId);
 
-  String toDataURL(String type);
+  String toDataURL(String type, [num quality]);
 }
 // 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.
 
 // WARNING: Do not edit - generated code.
 
 interface HTMLCollection extends List<Node> {
 
   final int length;
@@ skipping 9926 matching lines @@
     if (length < 0) throw new IllegalArgumentException('length');
     if (start < 0) throw new IndexOutOfRangeException(start);
     int end = start + length;
     if (end > a.length) throw new IndexOutOfRangeException(end);
     for (int i = start; i < end; i++) {
       accumulator.add(a[i]);
     }
     return accumulator;
   }
 }