Add tests for Chrome Stability Metrics.

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 1034 matching lines @@
       'browser/ui/autofill/autofill_dialog_i18n_input_unittest.cc',
       'browser/ui/autofill/country_combobox_model_unittest.cc',
       'browser/ui/autofill/data_model_wrapper_unittest.cc',
       'browser/ui/autofill/mock_address_validator.cc',
       'browser/ui/autofill/mock_address_validator.h',
       'browser/ui/autofill/mock_autofill_dialog_view_delegate.cc',
       'browser/ui/autofill/mock_autofill_dialog_view_delegate.h',
     ],
     'chrome_unit_tests_plugins_sources': [
       'browser/component_updater/component_installers_unittest.cc',
+      'browser/metrics/chrome_stability_metrics_provider_unittest.cc',
       'browser/metrics/plugin_metrics_provider_unittest.cc',
       'browser/plugins/plugin_finder_unittest.cc',
       'browser/plugins/plugin_info_message_filter_unittest.cc',
       'browser/plugins/plugin_installer_unittest.cc',
       'browser/plugins/plugin_metadata_unittest.cc',
       'browser/plugins/plugin_prefs_unittest.cc',
       'common/pepper_permission_util_unittest.cc',
     ],
     'chrome_unit_tests_print_preview_sources': [
       'browser/printing/cloud_print/cloud_print_proxy_service_unittest.cc',
@@ skipping 1860 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }