Adding synchronous measurement methods to Element.

lib/html/templates/html/interface/interface_Element.darttemplate

Index: lib/html/templates/html/interface/interface_Element.darttemplate
diff --git a/lib/html/templates/html/interface/interface_Element.darttemplate b/lib/html/templates/html/interface/interface_Element.darttemplate
index 620efdb8123de46d6b3bcb6fd37a2aae397319e8..212fbc58f3fe46bb57af30efb11bee9996443cc8 100644
--- a/lib/html/templates/html/interface/interface_Element.darttemplate
+++ b/lib/html/templates/html/interface/interface_Element.darttemplate
@@ -84,11 +84,32 @@ abstract class Element implements Node, NodeSelector {
   void addHTML(String html);
 
   /**
-   * @domName getClientRects, getBoundingClientRect, clientHeight, clientWidth,
-   * clientTop, clientLeft, offsetHeight, offsetWidth, offsetTop, offsetLeft,
-   * scrollHeight, scrollWidth, scrollTop, scrollLeft
+   * Synchronous implementation of [rect.client]
+   * If browser layout has been dirtied before this method is called then a
+   * re-layout will be forced and this may impact performance.
    */
-  Future<ElementRect> get rect;
+  ClientRect get client;
+
+  /**
+   * Synchronous implementation of [rect.offsetSync]
+   * If browser layout has been dirtied before this method is called then a
+   * re-layout will be forced and this may impact performance.
+   */
+  ClientRect get offset;
+
+  /**
+   * Synchronous implementation of [rect.scroll]
+   * If browser layout has been dirtied before this method is called then a
+   * re-layout will be forced and this may impact performance.
+   */
+  ClientRect get scroll;
+
+  /**
+   * Synchronous implementation of [rect.boundingClientRect]
+   * If browser layout has been dirtied before this method is called then a
+   * re-layout will be forced and this may impact performance.
+   */
+  ClientRect get boundingClientRect;
 
   /** @domName Window.getComputedStyle */
   Future<CSSStyleDeclaration> get computedStyle;