Make do-not-repaint-if-scrolling-composited-layers wait for frames.

Currently this test verifies that after setting the scroll position there are no paint invalidations, however paint invalidations could occur as part of the lifecycle after script runs. By waiting for the next frame we allow the lifecycle to become clean and commit the frame. This is also a speculative fix for what may have caused the old flakiness on the linked bug. Bug: 520166 Change-Id: I2cfe8fe47a89c39c81f83b23388f945549b8bc8e Reviewed-on: https://chromium-review.googlesource.com/1158718Reviewed-by: Stephen Chenney <schenney@chromium.org> Commit-Queue: Robert Flack <flackr@chromium.org> Cr-Commit-Position: refs/heads/master@{#579837}

Make do-not-repaint-if-scrolling-composited-layers wait for frames.
Currently this test verifies that after setting the scroll position there are no paint invalidations, however paint invalidations could occur as part of the lifecycle after script runs. By waiting for the next frame we allow the lifecycle to become clean and commit the frame. This is also a speculative fix for what may have caused the old flakiness on the linked bug. Bug: 520166 Change-Id: I2cfe8fe47a89c39c81f83b23388f945549b8bc8e Reviewed-on: https://chromium-review.googlesource.com/1158718Reviewed-by: Stephen Chenney <schenney@chromium.org> Commit-Queue: Robert Flack <flackr@chromium.org> Cr-Commit-Position: refs/heads/master@{#579837}
7eb2180c · Robert Flack · Commit Bot · 476e1865 · 7eb2180c
Commit 7eb2180c authored Aug 01, 2018 by Robert Flack Committed by Commit Bot Aug 01, 2018
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Showing with 35 additions and 19 deletions

third_party/WebKit/LayoutTests/compositing/overflow/do-not-repaint-if-scrolling-composited-layers.html ...erflow/do-not-repaint-if-scrolling-composited-layers.html +35 -19

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--- a/third_party/WebKit/LayoutTests/compositing/overflow/do-not-repaint-if-scrolling-composited-layers.html
+++ b/third_party/WebKit/LayoutTests/compositing/overflow/do-not-repaint-if-scrolling-composited-layers.html
@@ -2,8 +2,10 @@
 <html>
 <head>
 <script>
-    if (window.testRunner)
+    if (window.testRunner) {
        testRunner.dumpAsText();
+        testRunner.waitUntilDone();
+    }
    if (window.internals)
        internals.settings.setPreferCompositingToLCDTextEnabled(false);
@@ -21,15 +23,27 @@
        return false;
    }
-    function testScrollRepaint(description, expectsRepaint, scroller) {
+    function rAF() {
+      return new Promise(function(resolve) {
+        requestAnimationFrame(resolve);
+      });
+    }
+    async function testScrollRepaint(description, expectsRepaint, scroller) {
        var result = description + ":\n";
-        document.body.offsetTop;
+        // Ensure that any dirtiness has been committed
+        await rAF();
+        await rAF();
        if (window.internals)
            internals.startTrackingRepaints(document);
        scroller.scrollTop = 100;
+        // Wait until the next frame reflecting the new scroll position.
+        await rAF();
        if (window.internals) {
            var layer_tree = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_PAINT_INVALIDATIONS);
            var repainted = hasRepaint(layer_tree);
@@ -47,11 +61,11 @@
        return result;
    }
-    function testNoRepaint() {
+    async function testNoRepaint() {
        return testScrollRepaint("Overflow scroll", false, container);
    }
-    function testWithSelection() {
+    async function testWithSelection() {
        var selection = getSelection();
        var range = document.createRange();
@@ -62,44 +76,46 @@
        range.selectNode(document.getElementById("selection-end"));
        selection.addRange(range);
-        var result = testScrollRepaint("Overflow scroll with selection", false, container);
+        var result = await testScrollRepaint("Overflow scroll with selection", false, container);
        getSelection().removeAllRanges();
        return result;
    }
-    function testMarquee() {
+    async function testMarquee() {
        container.style.display = "none";
        marquee.style.display = "block";
-        var result = testScrollRepaint("Marquee", false, marquee);
+        var result = await testScrollRepaint("Marquee", false, marquee);
        marquee.style.display = "none";
        container.style.display = "block";
        return result;
    }
-    function testWithInlineChild() {
+    async function testWithInlineChild() {
        span.style.display = "inline";
-        var result = testScrollRepaint("Overflow scroll with inline child", false, container);
+        var result = await testScrollRepaint("Overflow scroll with inline child", false, container);
        span.style.display = "none";
        return result;
    }
-    function testOverflowHidden() {
+    async function testOverflowHidden() {
        container.style.overflow = "hidden";
-        var result = testScrollRepaint("Overflow hidden", true, container);
+        var result = await testScrollRepaint("Overflow hidden", true, container);
        container.style.overflow = "scroll";
        return result;
    }
-    function doTests() {
+    async function doTests() {
        marquee.stop();
-        var result = testNoRepaint();
+        var result = await testNoRepaint();
-        result += testWithSelection();
+        result += await testWithSelection();
-        result += testMarquee();
+        result += await testMarquee();
-        result += testWithInlineChild();
+        result += await testWithInlineChild();
-        result += testOverflowHidden();
+        result += await testOverflowHidden();
-        if (window.testRunner)
+        if (window.testRunner) {
            testRunner.setCustomTextOutput(result);
+            testRunner.notifyDone();
+        }
    }
    window.onload = doTests;