add missed jso methods

jso/apis/src/main/java/org/teavm/jso/browser/AnimationFrameCallback.java

@@ -0,0 +1,24 @@
+/*
+ *  Copyright 2016 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.jso.browser;
+
+import org.teavm.jso.JSFunctor;
+import org.teavm.jso.JSObject;
+
+@JSFunctor
+public interface AnimationFrameCallback extends JSObject {
+    void onAnimationFrame(double timestamp);
+}

jso/apis/src/main/java/org/teavm/jso/browser/Window.java

@@ -117,6 +117,12 @@ public abstract class Window implements JSObject, WindowEventTarget, StorageProv
     @JSBody(params = { "timeoutId" }, script = "clearInterval(timeoutId);")
     public static native void clearInterval(int timeoutId);
 
+    @JSBody(params = { "callback" }, script = "return requestAnimationFrame(callback);")
+    public static native int requestAnimationFrame(AnimationFrameCallback callback);
+
+    @JSBody(params = { "requestId" }, script = "cancelAnimationFrame(requestId);")
+    public static native void cancelAnimationFrame(int requestId);
+
     public abstract void blur();
 
     public abstract void focus();