[test] Add performance test for closures.

test/js-perf-test/JSTests.json

Index: test/js-perf-test/JSTests.json
diff --git a/test/js-perf-test/JSTests.json b/test/js-perf-test/JSTests.json
index 44b821f7b528993d01e9ab3b04a7b82498cb3412..8e15a194a32ade29660559b7c34b1528ad6253e5 100644
--- a/test/js-perf-test/JSTests.json
+++ b/test/js-perf-test/JSTests.json
@@ -76,6 +76,28 @@
       ]
     },
     {
+      "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"],
       "main": "run.js",