third_party/WebKit/LayoutTests/virtual/threaded/fast/idle-callback/timeout.html

   1 <!DOCTYPE html>
   2 <title>window.requestIdleCallback deals with timeouts correctly</title>
   3 <link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" />
   4 <link rel="help" href="http://www.w3.org/TR/requestidlecallback/"/>
   5 <script src="../../../../resources/testharness.js"></script>
   6 <script src="../../../../resources/testharnessreport.js"></script>
   7 <link rel="stylesheet" href="../../resources/testharness.css" />
   8 <script>
   9
  10 async_test(function() {
  11   // Check whether requestIdleCallback with a timeout works when the event loop
  12   // is busy.
  13   var busy_raf_loop_iterations_remaining = 10;  // Should take 20 * 40 = 400ms
  14   var idle_callback_scheduled;
  15   var idle_callback = this.step_func(function(deadline) {
  16     assert_false(deadline.didTimeout, "IdleDeadline.didTimeout MUST be false if requestIdleCallback wasn't scheduled due to a timeout");
  17     assert_equals(busy_raf_loop_iterations_remaining, 0, "Busy rAF loop should be finished by the time we get scheduled");
  18     this.done();
  19   });
  20
  21   var busy_raf_loop_iterations_remaining = 10;  // Should take 20 * 40 = 400ms
  22   requestAnimationFrame(this.step_func(function busyRAFLoop() {
  23     var start_time = performance.now();
  24     if (!idle_callback_scheduled) {
  25       idle_callback_scheduled = start_time;
  26       requestIdleCallback(idle_callback);
  27     }
  28
  29     // Use up the whole frame budget.
  30     while (performance.now() - start_time < 40) { }
  31     if (busy_raf_loop_iterations_remaining > 0) {
  32       busy_raf_loop_iterations_remaining--;
  33       requestAnimationFrame(busyRAFLoop);
  34     }
  35   }));
  36 }, 'requestIdleCallback not scheduled when event loop is busy.');
  37
  38 async_test(function() {
  39   // Check whether requestIdleCallback with a timeout works when the event loop
  40   // is busy.
  41   var busy_raf_loop_iterations_remaining = 10;  // Should take 20 * 40 = 400ms
  42   var timeout = 200;
  43   var idle_callback_scheduled;
  44   var idle_callback = this.step_func(function(deadline) {
  45     var time_delta = performance.now() - idle_callback_scheduled;
  46     assert_true(time_delta >= timeout, "Should only have been run after timeout");
  47     assert_true(deadline.timeRemaining() == 0, "IdleDeadline.timeRemaining MUST be equal to zero if requestIdleCallback was scheduled due to a timeout");
  48     assert_true(deadline.didTimeout, "IdleDeadline.didTimeout MUST be true if requestIdleCallback was scheduled due to a timeout");
  49     assert_true(busy_raf_loop_iterations_remaining > 0, "Busy rAF loop should still be going");
  50     this.done();
  51   });
  52
  53   requestAnimationFrame(this.step_func(function busyRAFLoop() {
  54     var start_time = performance.now();
  55     if (!idle_callback_scheduled) {
  56       idle_callback_scheduled = start_time;
  57       requestIdleCallback(idle_callback, timeout);
  58     }
  59
  60     // Use up the whole frame budget.
  61     while (performance.now() - start_time < 40) { }
  62     if (busy_raf_loop_iterations_remaining > 0) {
  63       busy_raf_loop_iterations_remaining--;
  64       requestAnimationFrame(busyRAFLoop);
  65     }
  66   }));
  67 }, 'requestIdleCallback scheduled with timeout when event loop is busy.');
  68
  69 </script>
  70 <h1>Description</h1>
  71 <p>This test validates that window.requestIdleCallback deals with timeouts correctly.</p>
  72 <div id="log"></div>