Adding support for animated pages in the FrameRate tests

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 34 matching lines @@
 var __t_est_total;
 var __t_est_squared_total;
 var __t_count;
 var __t_start;
 
 var __queued_gesture_functions;
 var __results;
 
 var __recording = [];
 var __advance_gesture;
+var __animation = function() {return false;}
 var __gestures = {
   none: [
     {"time_ms":1, "y":0},
     {"time_ms":5000, "y":0}
   ],
   steady: [
     {"time_ms":1, "y":0},
     {"time_ms":5, "y":10}
   ],
   reading: [
@@ skipping 89 matching lines @@
     {"time_ms":911, "y":1273},
     {"time_ms":941, "y":1275},
     {"time_ms":958, "y":1282},
     {"time_ms":976, "y":1288},
     {"time_ms":993, "y":1291},
     {"time_ms":1022, "y":1294},
     {"time_ms":1055, "y":1302}
   ],
 };
 
+var __builtin_gestures = {
+  init: [
+    {"time_ms":1, "y":0},
+    {"time_ms":5, "y":10}

[Justin Novosad, 2011/09/27 19:56:13]

factored this out of __gestures so that we don't have to redefine it every time
we override __gestures in a test page

+  ],
+};
+
 function __init_stats() {
   __t_last = undefined;
   __t_est = undefined;
   __t_est_total = 0;
   __t_est_squared_total = 0;
   __t_count = 0;
 }
 __init_stats();
 
 function __calc_results() {
@@ skipping 156 matching lines @@
 function __sched_update() {
   if (!__raf) {
     if ("webkitRequestAnimationFrame" in window)
       __raf = webkitRequestAnimationFrame;
     else if ("mozRequestAnimationFrame" in window)
       __raf = mozRequestAnimationFrame;
   }
   __raf(function() {
     __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())
+      // Only update the FPS if a gesture movement or animation occurs.
+      // Otherwise, the frame rate average becomes inaccurate after any pause.
+      var animated = __animation();
+      if (__advance_gesture() || animated)
         __update_fps();
       else
         __t_last = new Date().getTime();
     }
     __sched_update();
   }, document.body);
 }
 
 function __start_recording() {
   __start(__advance_gesture_recording);
 }
 
 function __make_body_composited() {
   document.body.style.webkitTransform = "translateZ(0)";
 }
 
 function __start(gesture_function) {
   if (__running)
     return;
   // Attempt to create a gesture function from a string name.
   if (typeof gesture_function == "string") {
-    if (!__gestures[gesture_function])
-      throw new Error("Unrecognized gesture name");
+    if (!__gestures[gesture_function]) {
+      if (!__builtin_gestures[gesture_function])
+        throw new Error("Unrecognized gesture name");
+      else
+        gesture_function = __create_repeating_gesture_function(
+                            __builtin_gestures[gesture_function]);
+    }
     else
       gesture_function = __create_repeating_gesture_function(
                             __gestures[gesture_function]);
   }
   else if (typeof gesture_function != "function")
     throw new Error("Argument is not a function or gesture name");
 
   __old_title = document.title;
   __advance_gesture = gesture_function;
   __t_start = new Date().getTime();
   __running = true;
   if (!__raf_is_live) {
     __sched_update();
   }
 }
 
 function __start_all() {
   __queued_gesture_functions = [];
   __results = {
     gestures: [],
     means: [],
     sigmas: [],
   };
 
   for (var gesture in __gestures) {
     __results.gestures.push(gesture);
     __queued_gesture_functions.push(gesture);
   }
   __running_all = true;
-  // Run steady gesture once to cache the webpage layout for subsequent tests.
-  __start("steady");
+  // Run init gesture once to cache the webpage layout for subsequent tests.
+  __start("init");
 }
 
 function __stop() {
   __running = false;
   document.title = __old_title;
   window.__scrolledTo = undefined;
 
   if (__running_all) {
     var results = __calc_results();
     __results.means.push(results.mean);
@@ skipping 13 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)";
 }