third_party/WebKit/LayoutTests/virtual/threaded/fast/scroll-behavior/first-scroll-runs-on-compositor.html - Issue 1801753002: First programmatic smooth scroll should run on the compositor if it can

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Side by Side Diff: third_party/WebKit/LayoutTests/virtual/threaded/fast/scroll-behavior/first-scroll-runs-on-compositor.html

Issue 1801753002: First programmatic smooth scroll should run on the compositor if it can (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: fix bot compile error Created 4 years, 9 months ago

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	1 <!DOCTYPE html>

	2 <script src="../../../../resources/js-test.js"></script>

	3 <style>

	4 body {

	5 width: 2000px;

	6 height: 2000px;

	7 }

	8 </style>

	9

	10 <script>

	11 var jsTestIsAsync = true;

	12

	13 description("This test verifies that the first programmatic smooth scroll " +

	14 "doesn't always run on the main thread (see crbug.com/592799).");

	15

	16 // From ScrollAnimatorCompositorCoordinator::RunState

	17 var RUNNING_ON_COMPOSITOR = "RunningOnCompositor";

	18

	19 function runTest() {

	20 if (document.scrollingElement.scrollTop == 0) {

	21 requestAnimationFrame(runTest);

	22 } else {

	23 // Check that initiated by main thread and running on the compositor.

	24 shouldBe("internals.getProgrammaticScrollAnimationState(document)",

	25 "RUNNING_ON_COMPOSITOR")

	26 shouldBecomeEqual("document.scrollingElement.scrollTop == 500",

	27 "true", finishJSTest);

	28 }

	29 }

	30

	31 onload = function() {

	32 if (!window.internals) {

	33 debug("This test requires window.internals.");

	34 finishJSTest();

	35 return;

	36 }

	37

	38 document.scrollingElement.scrollTop = 0;

	39

	40 window.scrollBy({top: 500, behavior: "smooth"});

	41

	42 runTest();

	43 };

	44

	45 </script>

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