Revert "Removing setImmediate and hiding WindowTimers interface"

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

Index: tools/dom/templates/html/impl/impl_Window.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Window.darttemplate b/tools/dom/templates/html/impl/impl_Window.darttemplate
index 19999f4bea96d6434262100231177124aad6489e..aaa1b97296d0dd76e9662ac907ce7ae04ce5292d 100644
--- a/tools/dom/templates/html/impl/impl_Window.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Window.darttemplate
@@ -12,6 +12,19 @@ $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $endif
 
   /**
+   * Executes a [callback] after the immediate execution stack has completed.
+   *
+   * This differs from using Timer.run(callback)
+   * because Timer will run in about 4-15 milliseconds, depending on browser,
+   * depending on load. [setImmediate], in contrast, makes browser-specific
+   * changes in behavior to attempt to run immediately after the current
+   * frame unwinds, causing the future to complete after all processing has
+   * completed for the current event, but before any subsequent events.
+   */
+  void setImmediate(TimeoutHandler callback) {
+    _addMicrotaskCallback(callback);
+  }
+  /**
    * Lookup a port by its [name].  Return null if no port is
    * registered under [name].
    */
@@ -208,6 +221,44 @@ $if DART2JS
 
   @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));
+  }
+$else
+  /// Checks if _setImmediate is supported.
+  static bool get _supportsSetImmediate => false;
+
+  /// Dartium stub for IE's setImmediate.
+  void _setImmediate(void callback()) {
+    throw new UnsupportedError('setImmediate is not supported');
+  }
+
+  /**
+   * Called to draw an animation frame and then request the window to repaint
+   * after [callback] has finished (creating the animation).
+   *
+   * Use this method only if you need to later call [cancelAnimationFrame]. If
+   * not, the preferred Dart idiom is to set animation frames by calling
+   * [animationFrame], which returns a Future.
+   *
+   * Returns a non-zero valued integer to represent the request id for this
+   * request. This value only needs to be saved if you intend to call
+   * [cancelAnimationFrame] so you can specify the particular animation to
+   * cancel.
+   *
+   * Note: The supplied [callback] needs to call [requestAnimationFrame] again
+   * for the animation to continue.
+   */
+  @DomName('Window.requestAnimationFrame')
+  int requestAnimationFrame(RequestAnimationFrameCallback callback) {
+    return _requestAnimationFrame(_wrapZone(callback));
+  }
 $endif
 
   /**