CanvasRenderingContext2D.fillText now works correctly with null maxWidth.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index ec9e4c41606952cc9122272346187a92d483c126..69dcdf6ceca5cea2b43f476cdd75cb8ad574705a 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -1365,9 +1365,10 @@ class CanvasRenderingContext2D extends CanvasRenderingContext native "CanvasRend
   @DocsEditable()
   void fillRect(num x, num y, num width, num height) native;
 
+  @JSName('fillText')
   @DomName('CanvasRenderingContext2D.fillText')
   @DocsEditable()
-  void fillText(String text, num x, num y, [num maxWidth]) native;
+  void _fillText(String text, num x, num y, [num maxWidth]) native;
 
   @DomName('CanvasRenderingContext2D.getContextAttributes')
   @DocsEditable()
@@ -1750,8 +1751,30 @@ class CanvasRenderingContext2D extends CanvasRenderingContext native "CanvasRend
   void set lineDashOffset(num value) => JS('void',
       'typeof #.lineDashOffset != "undefined" ? #.lineDashOffset = # : '
       '#.webkitLineDashOffset = #', this, this, value, this, value);
-}
 
+  /**
+   * Draws text to the canvas.
+   *
+   * The text is drawn starting at coordinates ([x], [y]).
+   * If [maxWidth] is provided and the [text] is computed to be wider than
+   * [maxWidth], then the drawn text is scaled down horizontally to fit.
+   *
+   * The text uses the current [CanvasRenderingContext2D.font] property for font
+   * options, such as typeface and size, and the current
+   * [CanvasRenderingContext2D.fillStyle] for style options such as color.
+   * The current [CanvasRenderingContext2D.textAlign] and
+   * [CanvasRenderingContext2D.textBaseLine] properties are also applied to the
+   * drawn text.
+   */
+  @DomName('CanvasRenderingContext2D.fillText')
+  void fillText(String text, num x, num y, [num maxWidth]) {
+    if (maxWidth != null) {
+      _fillText(text, x, y, maxWidth);
+    } else {
+      _fillText(text, x, y);
+    }
+  }
+}
 // 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.