Multicol performance tests for tall content (so that we get (very) ma…

…ny columns). This is currently horribly slow. Discovered while working on bug 502407 (assertion failure). It seems impossible to write a test for that issue that doesn't run into the performance problems illustrated by these tests, so we have to land some performance improvements before fixing the actual assertion. R=dsinclair@chromium.org Review URL: https://codereview.chromium.org/1239783002 git-svn-id: svn://svn.chromium.org/blink/trunk@198956 bbb929c8-8fbe-4397-9dbb-9b2b20218538
marcosholgado · Jul 15, 2015 · 480a977 · 480a977
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diff --git a/...d_party/WebKit/PerformanceTests/Layout/multicol/tall-content-short-columns-realistic.html b/...d_party/WebKit/PerformanceTests/Layout/multicol/tall-content-short-columns-realistic.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<script src="../../resources/runner.js"></script>
+<body style="overflow:scroll;"> <!-- don't want auto scrollbars to affect the number of layout passes. -->
+    <pre id="log"></pre>
+    <div id="target" style="position:absolute; top:0; left:0; display:none; -webkit-columns:2; column-fill:auto; width:40em; height:40em;">
+        <div style="height:1000000px;">xxxxxxxxxx</div>
+    </div>
+    <script>
+    var target = document.getElementById("target");
+    var style = target.style;
+
+    function test() {
+        style.display = "block";
+        PerfTestRunner.forceLayoutOrFullFrame();
+
+        // Do some hit-testing.
+        document.caretRangeFromPoint(10, 10);
+
+        style.display = "none";
+        PerfTestRunner.forceLayoutOrFullFrame();
+    }
+
+    PerfTestRunner.measureRunsPerSecond({
+        description: "Measures performance of multicol layout with many columns.",
+        run: test
+    });
+    </script>
+</body>
diff --git a/third_party/WebKit/PerformanceTests/Layout/multicol/tall-content-short-columns.html b/third_party/WebKit/PerformanceTests/Layout/multicol/tall-content-short-columns.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<script src="../../resources/runner.js"></script>
+<body style="overflow:scroll;"> <!-- don't want auto scrollbars to affect the number of layout passes. -->
+    <pre id="log"></pre>
+    <div id="target" style="position:absolute; top:0; left:0; display:none; -webkit-columns:2; column-fill:auto; width:40em; height:2em;">
+        <div style="height:1234567890px;">xxxxxxxxxx</div>
+    </div>
+    <script>
+    var target = document.getElementById("target");
+    var style = target.style;
+
+    function test() {
+        style.display = "block";
+        PerfTestRunner.forceLayoutOrFullFrame();
+
+        // Do some hit-testing.
+        document.caretRangeFromPoint(10, 10);
+
+        style.display = "none";
+        PerfTestRunner.forceLayoutOrFullFrame();
+    }
+
+    PerfTestRunner.measureRunsPerSecond({
+        description: "Measures performance of multicol layout with many columns.",
+        run: test
+    });
+    </script>
+</body>