Add a tool for clearing the system cache for a directory.

tools/perf/clear_system_cache/clear_system_cache.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.
+
 {
   'variables': {
     'chromium_code': 1,
   },
-  'targets': [
+  'targets' : [
     {
-      'target_name': 'set_default_handler',
+      'target_name': 'clear_system_cache',
       'type': 'executable',
+      'toolsets': ['target'],
       'dependencies': [
-        '../../base/base.gyp:base',
-        '../../win8/win8.gyp:test_support_win8',
-        '../../ui/ui.gyp:ui',
-      ],
-      'include_dirs': [
-        '../..',
+        '../../../base/base.gyp:base',
+        '../../../base/base.gyp:test_support_base',
       ],
       'sources': [
-        'set_default_handler_main.cc',
+        'clear_system_cache_main.cc',
       ],
     },
   ],
 }