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

   1 jsTestIsAsync = true;
   2
   3 description("Tests the timestamps provided to requestAnimationFrame callbacks advance");
   4
   5 function busyWait(millis) {
   6     var start = Date.now();
   7     while (Date.now()-start < millis) {}
   8 }
   9
  10 var firstTimestamp = undefined;
  11 var secondTimestamp = undefined;
  12
  13 window.requestAnimationFrame(function(timestamp) {
  14     firstTimestamp = timestamp;
  15     shouldBeDefined("firstTimestamp");
  16     window.requestAnimationFrame(function(timestamp) {
  17         secondTimestamp = timestamp;
  18         shouldBeDefined("secondTimestamp");
  19         shouldBeTrue("secondTimestamp > firstTimestamp");
  20         finishJSTest();
  21     });
  22     busyWait(10);
  23 });