Adding support for animated pages in the FrameRate tests

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

Index: chrome/test/data/perf/frame_rate/head.js
===================================================================
--- chrome/test/data/perf/frame_rate/head.js	(revision 102775)
+++ chrome/test/data/perf/frame_rate/head.js	(working copy)
@@ -52,6 +52,7 @@
 
 var __recording = [];
 var __advance_gesture;
+var __animation = function() {return false;}
 var __gestures = {
   none: [
     {"time_ms":1, "y":0},
@@ -161,6 +162,13 @@
   ],
 };
 
+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;
@@ -337,9 +345,10 @@
   __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();
@@ -361,8 +370,13 @@
     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]);
@@ -392,8 +406,8 @@
     __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() {