Making almost all dom_ methods private. Exceptions will be addressed in a later CL.

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

 // 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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $!MEMBERS
 
   /**
@@ skipping 28 matching lines @@
    * [s], [l] are in percent, 0-100.
    * [a] is 0-1.
    */
   void setStrokeColorHsl(int h, num s, num l, [num a = 1]) {
     this.strokeStyle = 'hsla($h, $s%, $l%, $a)';
   }
 
   @DomName('CanvasRenderingContext2D.arc')
   void arc(num x,  num y,  num radius,  num startAngle, num endAngle,
       [bool anticlockwise = false]) {
-    $dom_arc(x, y, radius, startAngle, endAngle, anticlockwise);
+    _arc(x, y, radius, startAngle, endAngle, anticlockwise);
   }
 
   /**
    * Draws an image from a CanvasImageSource to an area of this canvas.
    *
    * The image will be drawn to an area of this canvas defined by
    * [destRect]. [sourceRect] defines the region of the source image that is
    * drawn.
    * If [sourceRect] is not provided, then
    * the entire rectangular image from [source] will be drawn to this context.
@@ skipping 200 matching lines @@
   @DomName('CanvasRenderingContext2D.lineDashOffset')
   void set lineDashOffset(num value) => JS('void',
       'typeof #.lineDashOffset != "undefined" ? #.lineDashOffset = # : '
       '#.webkitLineDashOffset = #', this, this, value, this, value);
 $else
   // TODO(amouravski): Add Dartium native methods for drawImage once we figure
   // out how to not break native bindings.
 $endif
 }