[test] Bump timeout for js-test Strings on Android

test/js-perf-test/JSTests.json

 {
   "name": "JSTests",
   "run_count": 3,
   "run_count_android_arm": 1,
   "run_count_android_arm64": 1,
   "timeout": 120,
   "units": "score",
   "total": true,
   "resources": ["base.js"],
   "tests": [
@@ skipping 101 matching lines @@
       ]
     },
     {
       "name": "Strings",
       "path": ["Strings"],
       "main": "run.js",
       "resources": ["harmony-string.js"],
       "results_regexp": "^%s\\-Strings\\(Score\\): (.+)$",
       "run_count": 1,
       "timeout": 240,
+      "timeout_android_arm": 360,
       "tests": [
         {"name": "StringFunctions"}
       ]
     },
     {
       "name": "StringIterators",
       "path": ["StringIterators"],
       "main": "run.js",
       "resources": ["string-iterator.js"],
       "results_regexp": "^%s\\-StringIterators\\(Score\\): (.+)$",
@@ skipping 97 matching lines @@
         {"name": "Object.hasOwnProperty--DEINTERN-prop"},
         {"name": "Object.hasOwnProperty--NE-INTERN-prop"},
         {"name": "Object.hasOwnProperty--NE-DEINTERN-prop"},
         {"name": "Object.hasOwnProperty--el"},
         {"name": "Object.hasOwnProperty--el-str"},
         {"name": "Object.hasOwnProperty--NE-el"}
       ]
     }
   ]
 }