Record language usage as UMA histograms.

chrome/chrome_tests.gypi

 # Copyright (c) 2011 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 1435 matching lines @@
         'browser/importer/firefox_importer_unittest_utils_mac.cc',
         'browser/importer/firefox_importer_utils_unittest.cc',
         'browser/importer/firefox_profile_lock_unittest.cc',
         'browser/importer/firefox_proxy_settings_unittest.cc',
         'browser/importer/importer_unittest.cc',
         'browser/importer/safari_importer_unittest.mm',
         'browser/importer/toolbar_importer_unittest.cc',
         'browser/instant/instant_loader_manager_unittest.cc',
         'browser/instant/promo_counter_unittest.cc',
         'browser/internal_auth_unittest.cc',
+        'browser/language_usage_metrics_unittest.cc',
         'browser/mac/keystone_glue_unittest.mm',
         'browser/media/media_internals_unittest.cc',
         'browser/metrics/display_utils_unittest.cc',
         'browser/metrics/metrics_log_unittest.cc',
         'browser/metrics/metrics_response_unittest.cc',
         'browser/metrics/metrics_service_unittest.cc',
         'browser/metrics/thread_watcher_unittest.cc',
         'browser/mock_keychain_mac.cc',
         'browser/mock_keychain_mac.h',
         'browser/mock_plugin_exceptions_table_model.cc',
@@ skipping 2691 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }