Add metrics to help measure effects of installing default apps in a profile.

chrome/browser/extensions/extension_service.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/json/json_value_serializer.h"
 #include "base/logging.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/stl_util.h"
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_plugin_service_filter.h"
 #include "chrome/browser/extensions/app_notification_manager.h"
 #include "chrome/browser/extensions/apps_promo.h"
 #include "chrome/browser/extensions/crx_installer.h"
+#include "chrome/browser/extensions/default_apps_trial.h"
 #include "chrome/browser/extensions/extension_accessibility_api.h"
 #include "chrome/browser/extensions/extension_bookmarks_module.h"
 #include "chrome/browser/extensions/extension_browser_event_router.h"
 #include "chrome/browser/extensions/extension_cookies_api.h"
 #include "chrome/browser/extensions/extension_data_deleter.h"
 #include "chrome/browser/extensions/extension_downloads_api.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
 #include "chrome/browser/extensions/extension_global_error.h"
 #include "chrome/browser/extensions/extension_history_api.h"
 #include "chrome/browser/extensions/extension_host.h"
@@ skipping 920 matching lines @@
       Source<Profile>(profile_),
       Details<const std::string>(&extension_id));
 
   if (sync_bundle && sync_bundle->HasExtensionId(extension_id)) {
     sync_bundle->sync_processor->ProcessSyncChanges(
         FROM_HERE, SyncChangeList(1, sync_change));
     sync_bundle->synced_extensions.erase(extension_id);
   }
 
   // Track the uninstallation.
-  UserMetrics::RecordAction(
-      UserMetricsAction("Extensions.ExtensionUninstalled"));
+  UMA_HISTOGRAM_ENUMERATION("Extensions.ExtensionUninstalled", 1, 2);
+
+  static bool default_apps_trial_exists =
+      base::FieldTrialList::TrialExists(kDefaultAppsTrial_Name);
+  if (default_apps_trial_exists) {
+    UMA_HISTOGRAM_ENUMERATION(
+        base::FieldTrial::MakeName("Extensions.ExtensionUninstalled",
+                                   kDefaultAppsTrial_Name),
+        1, 2);
+  }
 
   // Uninstalling one extension might have solved the problems of others.
   // Therefore, we clear warnings of this type for all extensions.
   std::set<ExtensionWarningSet::WarningType> warnings;
   extension_warnings_.GetWarningsAffectingExtension(extension_id, &warnings);
   extension_warnings_.ClearWarnings(warnings);
 
   return true;
 }
 
@@ skipping 2021 matching lines @@
 
 ExtensionService::NaClModuleInfoList::iterator
     ExtensionService::FindNaClModule(const GURL& url) {
   for (NaClModuleInfoList::iterator iter = nacl_module_list_.begin();
        iter != nacl_module_list_.end(); ++iter) {
     if (iter->url == url)
       return iter;
   }
   return nacl_module_list_.end();
 }