Add performance tests for full frame cycle

third_party/WebKit/LayoutTests/fast/harness/perftests/measure-time.html

Index: third_party/WebKit/LayoutTests/fast/harness/perftests/measure-time.html
diff --git a/third_party/WebKit/LayoutTests/fast/harness/perftests/measure-time.html b/third_party/WebKit/LayoutTests/fast/harness/perftests/measure-time.html
new file mode 100644
index 0000000000000000000000000000000000000000..a731f4829490c925faa1c7953238ef5682aed401
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/fast/harness/perftests/measure-time.html
@@ -0,0 +1,21 @@
+<script src="../../../../PerformanceTests/resources/runner.js"></script>
+<script>
+// The initial value doesn't affect result.
+var virtualTime = 123456;
+PerfTestRunner.now = function () { return virtualTime; }
+
+var originalSetTimeout = window.setTimeout;
+window.setTimeout = function(f, t) {
+  // This doesn't affect result.
+  virtualTime += 654321;
+  originalSetTimeout(f, t);
+};
+
+PerfTestRunner.measureTime({
+  run: function () {
+    virtualTime += 20;
+  },
+  warmUpCount: 3,
+  doNotMeasureMemoryUsage: true,
+});
+</script>