Add a metrics extensions API....

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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' : {
     'browser_tests_sources_views_specific': [
       'browser/extensions/browser_action_test_util_views.cc',
       'browser/views/browser_actions_container_unittest.cc',
       'browser/views/find_bar_host_browsertest.cc',
@@ skipping 1142 matching lines @@
         'browser/extensions/extension_browsertest.cc',
         'browser/extensions/extension_browsertest.h',
         'browser/extensions/extension_browsertests_misc.cc',
         'browser/extensions/extension_crash_recovery_browsertest.cc',
         'browser/extensions/extension_history_apitest.cc',
         'browser/extensions/extension_i18n_apitest.cc',
         'browser/extensions/extension_incognito_apitest.cc',
         'browser/extensions/extension_javascript_url_apitest.cc',
         'browser/extensions/extension_management_tests.cc',
         'browser/extensions/extension_messages_apitest.cc',
+        'browser/extensions/extension_metrics_apitest.cc',
         'browser/extensions/extension_override_apitest.cc',
         'browser/extensions/extension_processes_apitest.cc',
         'browser/extensions/extension_startup_unittest.cc',
         'browser/extensions/extension_tabs_apitest.cc',
         'browser/extensions/extension_toolbar_model_unittest.cc',
         'browser/extensions/extension_toolstrip_apitest.cc',
         'browser/extensions/extension_websocket_apitest.cc',
         'browser/extensions/fragment_navigation_apitest.cc',
         'browser/extensions/isolated_world_apitest.cc',
         'browser/extensions/page_action_apitest.cc',
@@ skipping 859 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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