Example showing alternate async measurement solution

client/html/src/CSSStyleDeclarationWrappingImplementation.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 // This file was generated by html/scripts/css_code_generator.py
 
 // Source of CSS properties:
 //   Source/WebCore/css/CSSPropertyNames.in
 
 // TODO(jacobr): add versions that take numeric values in px, miliseconds, etc.
 
 class CSSStyleDeclarationWrappingImplementation extends DOMWrapperBase implements CSSStyleDeclaration {
   static String _cachedBrowserPrefix;
+  /**
+   * The element this style declaration is associated with if any.  This
+   * should only be set to a non-null value if modifying this object
+   * will change the associated element.  Thus this should not be set for
+   * computed styles.
+   */    
+  final ElementWrappingImplementation _element;
 
-  CSSStyleDeclarationWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
+  CSSStyleDeclarationWrappingImplementation._wrap(ptr)
+      : super._wrap(ptr), _element = null;
+  CSSStyleDeclarationWrappingImplementation._wrapWithElement(
+      ptr, this._element) : super._wrap(ptr);
 
   factory CSSStyleDeclarationWrappingImplementation.css(String css) {
     var style = new Element.tag('div').style;
     style.cssText = css;
     return style;
   }
 
   factory CSSStyleDeclarationWrappingImplementation() {
     return new CSSStyleDeclarationWrappingImplementation.css('');
   }
 
   static String get _browserPrefix() {
     if (_cachedBrowserPrefix === null) {
       if (_Device.isFirefox) {
         _cachedBrowserPrefix = '-moz-';
       } else {
         _cachedBrowserPrefix = '-webkit-';
       }
-      // TODO(jacobr): support IE 9.0 and Opera as well.
+      // TODO(jacobr): support IE and Opera as well.
     }
     return _cachedBrowserPrefix;
   }
 
-  String get cssText() { return _ptr.cssText; }
+  String get cssText() => _ptr.cssText;
 
-  void set cssText(String value) { _ptr.cssText = value; }
+  bool get _inDocument() {
+    return _element !== null && _element._inDocument;
+  }
+
+  void set cssText(String value) {
+    assert(!_inMeasurementFrame || !_inDocument);
+    _ptr.cssText = value;
+  }
 
   int get length() { return _ptr.length; }
 
   CSSRule get parentRule() { return LevelDom.wrapCSSRule(_ptr.parentRule); }
 
   CSSValue getPropertyCSSValue(String propertyName) {
     return LevelDom.wrapCSSValue(_ptr.getPropertyCSSValue(propertyName));
   }
 
   String getPropertyPriority(String propertyName) {
@@ skipping 10 matching lines @@
 
   bool isPropertyImplicit(String propertyName) {
     return _ptr.isPropertyImplicit(propertyName);
   }
 
   String item(int index) {
     return _ptr.item(index);
   }
 
   String removeProperty(String propertyName) {
+    assert(!_inMeasurementFrame || !_inDocument);
     return _ptr.removeProperty(propertyName);
   }
 
   void setProperty(String propertyName, var value, [String priority = '']) {
+    assert(!_inMeasurementFrame || !_inDocument);
     _ptr.setProperty(propertyName, '$value', priority);
   }
 
-  String get typeName() { return "CSSStyleDeclaration"; }
-
-
   /** Gets the value of "animation" */
   String get animation() =>
     getPropertyValue('${_browserPrefix}animation');
 
   /** Sets the value of "animation" */
   void set animation(var value) {
     setProperty('${_browserPrefix}animation', value, '');
   }
 
   /** Gets the value of "animation-delay" */
@@ skipping 2743 matching lines @@
 
   /** Gets the value of "zoom" */
   String get zoom() =>
     getPropertyValue('zoom');
 
   /** Sets the value of "zoom" */
   void set zoom(var value) {
     setProperty('zoom', value, '');
   }
 }