Factor out a perf test result printer method.

testing/perf/perf_test.gyp

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
+
 {
   'targets': [
     {
-      'target_name': 'adb_reboot',
-      'type': 'executable',
+      'target_name': 'perf_test',
+      'type': 'static_library',
       'sources': [
-        'adb_reboot.c',
+        'perf_test.cc',
+      ],
+      'dependencies': [
+        '../../base/base.gyp:base',
       ],
     },
   ],
 }