CanvasRenderingContext2D.fillText now works correctly with null maxWidth.

tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate

Index: tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate b/tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate
index 1a5631b91f64fc68a22ddd4324a097ed1c19e092..59dd5212f398175fadcb133331567e2d86bd7570 100644
--- a/tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate
+++ b/tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate
@@ -265,5 +265,31 @@ $else
   // TODO(amouravski): Add Dartium native methods for drawImage once we figure
   // out how to not break native bindings.
 $endif
-}
 
+  /**
+   * 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]) {

[Emily Fortuna, 2013/10/19 00:29:46]

how about instead write this function this way:

$if DART2JS
void fillText(String text, num x, num y, [num maxWidth]) {
   if (maxWidth != null) {
      JS('void', '#.fillText(#, #, #, #)', this, text, x, y, maxWidth);
   } else {
      JS('void', '#.fillText(#, #, #)', this, text, x, y);
   }
}
$endif 

and then put "fillText" in the js_custom_methods in system_html.py

[Andrei Mouravski, 2013/10/21 19:39:09]

Done.

+$if DART2JS
+    if (maxWidth != null) {
+      _fillText(text, x, y, maxWidth);
+    } else {
+      _fillText(text, x, y);
+    }
+$else
+    _fillText(text, x, y, maxWidth);
+$endif
+  }
+}