Fixed RAF call in the frame rate test.

chrome/test/data/perf/frame_rate/head.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview  Perform various "gestures" and calculate average frame rate.
  * "Gestures" are recorded scrolling behaviors in terms of time (ms) and
  * absolute positions.
  *
  * How to run a single gesture:
@@ skipping 264 matching lines @@
     __raf_is_live = true;
     if (__running) {
       // Only update the FPS if a gesture movement occurs. Otherwise, the frame
       // rate average becomes inaccurate after any pause.
       if (__advance_gesture())
         __update_fps();
       else
         __t_last = new Date().getTime();
     }
     __sched_update();
-  });
+  }, document.body);
 }
 
 function __start_recording() {
   __start(__advance_gesture_recording);
 }
 
 function __start(gesture_function) {
   if (__running)
     return;
   // Attempt to create a gesture function from a string name.
@@ skipping 56 matching lines @@
   __running = false;
   __running_all = false;
   document.title = __old_title;
   document.body.scrollTop = 0;
   __init_stats();
 }
 
 function __force_compositor() {
   document.body.style.webkitTransform = "translateZ(0)";
 }