Add components tests

components/components_tests.gypi

 # Copyright (c) 2012 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': 'sudden_motion_sensor',
-      'type': 'static_library',
+      'target_name': 'components_unittests',
+      'type': '<(gtest_target_type)',
+      'sources': [
+        'test/run_all_unittests.cc',
+      ],
       'dependencies': [
-        '<(DEPTH)/base/base.gyp:base',
+        '../base/base.gyp:test_support_base',
+        '../testing/gtest.gyp:gtest',
       ],
-      'sources': [
-        'sudden_motion_sensor_mac.cc',
-        'sudden_motion_sensor_mac.h',
-      ],
-    },
-  ],
+    }
+  ]
 }