third_party/WebKit/LayoutTests/fast/animation/script-tests/request-animation-frame-timestamps.js

   1 description("Tests the timestamps provided to requestAnimationFrame callbacks");
   2
   3 function busyWait(millis) {
   4     var start = Date.now();
   5     while (Date.now()-start < millis) {}
   6 }
   7
   8 var firstTimestamp = undefined;
   9
  10 window.requestAnimationFrame(function(timestamp) {
  11     firstTimestamp = timestamp;
  12     shouldBeDefined("firstTimestamp");
  13     busyWait(10);
  14 });
  15
  16 var secondTimestamp = undefined;
  17 window.requestAnimationFrame(function(timestamp) {
  18     secondTimestamp = timestamp;
  19     shouldBeDefined("secondTimestamp");
  20     shouldBe("firstTimestamp", "secondTimestamp");
  21 });
  22
  23 if (window.testRunner)
  24     testRunner.waitUntilDone();
  25
  26 requestAnimationFrame(function() {
  27     shouldBeDefined("firstTimestamp");
  28     isSuccessfullyParsed();
  29     if (window.testRunner)
  30         testRunner.notifyDone();
  31 });