Add performance tests for full frame cycle

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

Index: third_party/WebKit/LayoutTests/fast/harness/perftests/measure-frame-time.html
diff --git a/third_party/WebKit/LayoutTests/fast/harness/perftests/measure-frame-time.html b/third_party/WebKit/LayoutTests/fast/harness/perftests/measure-frame-time.html
new file mode 100644
index 0000000000000000000000000000000000000000..bcf0759a4c51b4627bad4f06976b95e35f0152e0
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/fast/harness/perftests/measure-frame-time.html
@@ -0,0 +1,20 @@
+<script src="../../../../PerformanceTests/resources/runner.js"></script>
+<script>
+// The initial value doesn't affect result.
+var virtualTime = Math.floor(Math.random() * 100000);
+PerfTestRunner.now = function () { return virtualTime; }
+
+var originalRequestAnimationFrame = window.requestAnimationFrame;
+window.requestAnimationFrame = function(f) {
+  virtualTime += 10;
+  originalRequestAnimationFrame(f);
+};
+
+PerfTestRunner.measureFrameTime({
+  run: function () {
+    virtualTime += 20;
+  },
+  warmUpCount: 3,
+  doNotMeasureMemoryUsage: true,
+});
+</script>