This CL contains all of the changes for splitting off all of the native

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;
 
+$!TOPLEVEL
+
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $!MEMBERS
 
   /**
    * Sets the color used inside shapes.
    * [r], [g], [b] are 0-255, [a] is 0-1.
    */
   void setFillColorRgb(int r, int g, int b, [num a = 1]) {
     this.fillStyle = 'rgba($r, $g, $b, $a)';
   }
@@ skipping 321 matching lines @@
   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
 }