Changing window.requestLayoutFrame into a microtask API

tools/dom/templates/html/dart2js/impl_Window.darttemplate

Index: tools/dom/templates/html/dart2js/impl_Window.darttemplate
diff --git a/tools/dom/templates/html/dart2js/impl_Window.darttemplate b/tools/dom/templates/html/dart2js/impl_Window.darttemplate
index 037ef2d5ab7c5c7123dd4fe666c50f5acb12a531..1d7058681c24a132c9b87d95c38cb969d1005685 100644
--- a/tools/dom/templates/html/dart2js/impl_Window.darttemplate
+++ b/tools/dom/templates/html/dart2js/impl_Window.darttemplate
@@ -71,12 +71,13 @@ $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS native "@*DOMWindow" {
   }
 
   /**
-   * Executes a [callback] after the next batch of browser layout measurements
-   * has completed or would have completed if any browser layout measurements
-   * had been scheduled.
+   * Executes a [callback] after the immediate execution stack has completed.
+   *
+   * This will cause the callback to be executed after all processing has
+   * completed for the current event, but before any subsequent events.
    */
-  void requestLayoutFrame(TimeoutHandler callback) {
-    _addMeasurementFrameCallback(callback);
+  void setImmediate(TimeoutHandler callback) {
+    _addMicrotaskCallback(callback);
   }
 
   @DomName('DOMWindow.requestAnimationFrame')
@@ -159,5 +160,14 @@ $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS native "@*DOMWindow" {
   @DomName('Window.console')
   Console get console => Console.safeConsole;
 
+  /// Checks if _setImmediate is supported.
+  static bool get _supportsSetImmediate =>
+      JS('bool', '!!(window.setImmediate)');
+
+  // Set immediate implementation for IE
+  void _setImmediate(void callback()) {
+    JS('void', '#.setImmediate(#)', this, convertDartClosureToJS(callback, 0));
+  }
+
 $!MEMBERS
 }