Browser compat for window.requestAnimationFrame

lib/html/frog/html_frog.dart

Index: lib/html/frog/html_frog.dart
diff --git a/lib/html/frog/html_frog.dart b/lib/html/frog/html_frog.dart
index f8d7217e78ce99f46c41db63265b7c795180828a..8643d501d9e408500912ba3efd5e1720d4c53772 100644
--- a/lib/html/frog/html_frog.dart
+++ b/lib/html/frog/html_frog.dart
@@ -16256,6 +16256,24 @@ class _WindowImpl extends _EventTargetImpl implements Window native "@*DOMWindow
     _addMeasurementFrameCallback(callback);
   }
 
+  /** @domName DOMWindow.requestAnimationFrame */
+  int requestAnimationFrame(RequestAnimationFrameCallback callback) native '''
+    if (!window.requestAnimationFrame) {
+      window.requestAnimationFrame =
+          window.webkitRequestAnimationFrame ||
+          window.mozRequestAnimationFrame ||
+          window.msRequestAnimationFrame ||
+          window.oRequestAnimationFrame ||
+          function (callback) {
+            window.setTimeout(callback, 16 /* 16ms ~= 60fps */);
+          };
+    }
+    return window.requestAnimationFrame(callback);
+''';
+
+  // Protect member 'requestAnimationFrame'.
+  _requestAnimationFrame() native 'requestAnimationFrame';
+
 
   _WindowEventsImpl get on() =>
     new _WindowEventsImpl(this);
@@ -34328,6 +34346,10 @@ interface Window extends EventTarget {
   void requestLayoutFrame(TimeoutHandler callback);
 
 
+  /** @domName DOMWindow.webkitRequestAnimationFrame */
+  int requestAnimationFrame(RequestAnimationFrameCallback callback);
+
+
   /**
    * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
    */