WIP - compositor worker mega patch.

third_party/WebKit/ManualTests/compositor-worker/scroll-animation.js

+(function(scope) {
+  "use strict";
+
+  scope.isMain = function() {
+    return scope.window;
+  };
+
+  scope.tick = function(timestamp) {
+    var newOffset = (Math.sin(timestamp ) + 1) * 500;
+    scroller.scrollTop = newOffset;
+    scope.requestAnimationFrame(tick);
+  };
+
+  scope.initWorker = function() {
+    console.log("init worker");
+    self.onmessage = function(e) {
+      console.log("onmessage");
+      scope.scroller = e.data[0];
+      scope.requestAnimationFrame(tick);
+    };
+  };
+
+  scope.initMain = function() {
+    console.log("init main");
+
+    scope.worker = new CompositorWorker("scroll-animation.js");
+    var scrollElement = document.getElementById("scroller");
+    scope.scroller = new CompositorProxy(scrollElement, ['scrollTop']);
+    scrollElement.addEventListener("scroll", function(e) {
+      this.style.top = (910 - e.target.scrollTop) + "px";
+      var start = new Date();
+      while (true) {
+        var now = new Date();
+        if (now.getTime() - start.getTime() > 200)
+          break;
+      }
+    }.bind(document.getElementById("thingy")));
+    worker.postMessage([scroller]);
+  };
+
+  if (isMain())
+    initMain();
+  else
+    initWorker();
+})(self);