Roll 50: Updated for push to origin/master.

tools/dom/templates/html/impl/impl_HTMLDocument.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.
 
 // WARNING: Do not edit - generated code.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
 $!MEMBERS
@@ skipping 27 matching lines @@
    * Checks if the getCssCanvasContext API is supported on the current platform.
    *
    * See also:
    *
    * * [getCssCanvasContext]
    */
 $if DART2JS
   static bool get supportsCssCanvasContext =>
       JS('bool', '!!(document.getCSSCanvasContext)');
 $else
-  static bool get supportsCssCanvasContext => true;
+  static bool get supportsCssCanvasContext => false;
 $endif
 
 
   /**
    * Gets a CanvasRenderingContext which can be used as the CSS background of an
    * element.
    *
    * CSS:
    *
    *     background: -webkit-canvas(backgroundCanvas)
    *
    * Generate the canvas:
    *
    *     var context = document.getCssCanvasContext('2d', 'backgroundCanvas',
    *         100, 100);
    *     context.fillStyle = 'red';
    *     context.fillRect(0, 0, 100, 100);
    *
    * See also:
    *
    * * [supportsCssCanvasContext]
    * * [CanvasElement.getContext]
    */
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
   @DomName('Document.getCSSCanvasContext')
   CanvasRenderingContext getCssCanvasContext(String contextId, String name,
       int width, int height) {
-    return _getCssCanvasContext(contextId, name, width, height);
+$if DART2JS
+      if (HtmlDocument.supportsCssCanvasContext)
+        return JS('CanvasRenderingContext', '#.getCSSCanvasContext(#, #, #, #)', this, contextId, name, width, height);
+$endif
+      throw new UnsupportedError("Not supported");
   }
 
   @DomName('Document.head')
   HeadElement get head => _head;
 
   @DomName('Document.lastModified')
   String get lastModified => _lastModified;
 
   @DomName('Document.preferredStylesheetSet')
   String get preferredStylesheetSet => _preferredStylesheetSet;
@@ skipping 381 matching lines @@
   /// parameter must be provided.
   @Experimental()
   ElementUpgrader createElementUpgrader(Type type, {String extendsTag}) {
 $if DART2JS
     return new _JSElementUpgrader(this, type, extendsTag);
 $else
     return new _VMElementUpgrader(this, type, extendsTag);
 $endif
   }
 }