[test] Add performance test for closures.

Short living closures are very common in Node.js. This benchmark tracks progress
as we move the optimizations that are currently only behind
--mark_shared_functions_for_tier_up to the default settings.

BUG=v8:5512

Committed: https://crrev.com/f277da2a00cfd27d44a33a70213a65bd82d0bc95
Review-Url: https://codereview.chromium.org/2525053002
Cr-Original-Commit-Position: refs/heads/master@{#41246}
Cr-Commit-Position: refs/heads/master@{#41487}

test/js-perf-test/Closures/closures.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+new BenchmarkSuite('Closures', [1000], [
+  new Benchmark('ShortLivingClosures', false, false, 0,
+    ShortLivingClosures, ShortLivingClosuresSetup, ShortLivingClosuresTearDown)
+]);
+
+// ----------------------------------------------------------------------------
+
+
+// The pattern is this example is very common in Node.js.
+var fs = {
+  readFile: function(filename, cb) {
+    cb(null, {length: 12});
+  }
+};
+
+
+function printLength (filename) {
+  fs.readFile(filename, foo);
+
+  function foo (err, buf)  {
+    if (err) return;
+    for (var j = 0; j<1000; j++) {
+      // Do some work to make the optimization actually worth while
+      buf.length++;
+    }
+    return (buf.length);
+  }
+}
+
+
+function ShortLivingClosuresSetup() {}
+
+function ShortLivingClosures() {
+  result = printLength('foo_bar.js');
+}
+
+function ShortLivingClosuresTearDown() {
+  return result == 1012;
+}

test/js-perf-test/Closures/run.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+load('../base.js');
+load('closures.js');
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(name + '-Closures(Score): ' + result);
+}
+
+
+function PrintError(name, error) {
+  PrintResult(name, error);
+  success = false;
+}
+
+
+BenchmarkSuite.config.doWarmup = undefined;
+BenchmarkSuite.config.doDeterministic = undefined;
+
+BenchmarkSuite.RunSuites({ NotifyResult: PrintResult,
+                           NotifyError: PrintError });

test/js-perf-test/JSTests.json

@@ -75,6 +75,28 @@
         {"name": "DefaultConstructor"}
       ]
     },
+    {
+      "name": "Closures",
+      "path": ["Closures"],
+      "main": "run.js",
+      "resources": ["closures.js"],
+      "flags": [],
+      "results_regexp": "^%s\\-Closures\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "Closures"}
+      ]
+    },
+    {
+      "name": "ClosuresMarkForTierUp",
+      "path": ["Closures"],
+      "main": "run.js",
+      "resources": ["closures.js"],
+      "flags": ["--mark_shared_functions_for_tier_up"],
+      "results_regexp": "^%s\\-Closures\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "Closures"}
+      ]
+    },
     {
       "name": "Collections",
       "path": ["Collections"],