Add an automatic settings reset banner.

chrome/browser/prefs/chrome_pref_service_factory.cc

 // 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.
 
 #include "chrome/browser/prefs/chrome_pref_service_factory.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
 #include "base/files/file_path.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/default_pref_store.h"
 #include "base/prefs/json_pref_store.h"
 #include "base/prefs/pref_filter.h"
 #include "base/prefs/pref_notifier_impl.h"
 #include "base/prefs/pref_registry.h"
+#include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/pref_store.h"
 #include "base/prefs/pref_value_store.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/command_line_pref_store.h"
 #include "chrome/browser/prefs/pref_hash_filter.h"
+#include "chrome/browser/prefs/pref_hash_store.h"
 #include "chrome/browser/prefs/pref_hash_store_impl.h"
 #include "chrome/browser/prefs/pref_model_associator.h"
 #include "chrome/browser/prefs/pref_service_syncable.h"
 #include "chrome/browser/prefs/pref_service_syncable_factory.h"
 #include "chrome/browser/profiles/file_path_verifier_win.h"
 #include "chrome/browser/ui/profile_error_dialog.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/pref_names.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 198 matching lines @@
 #endif
 
   return make_scoped_ptr(new PrefHashStoreImpl(
       profile_path.AsUTF8Unsafe(),
       seed,
       device_id,
       g_browser_process->local_state()));
 #endif
 }
 
+void HandleResetEvent() {
+  g_browser_process->local_state()->SetInt64(
+      prefs::kProfilePreferenceResetTime,
+      base::Time::Now().ToInternalValue());
+}
+
 scoped_ptr<PrefHashFilter> CreatePrefHashFilter(
     scoped_ptr<PrefHashStore> pref_hash_store) {
   return make_scoped_ptr(new PrefHashFilter(pref_hash_store.Pass(),
                                             kTrackedPrefs,
                                             arraysize(kTrackedPrefs),
                                             kTrackedPrefsReportingIDsCount,
-                                            GetSettingsEnforcementLevel()));
+                                            GetSettingsEnforcementLevel(),
+                                            base::Bind(&HandleResetEvent)));
 }
 
 void PrepareBuilder(
     PrefServiceSyncableFactory* factory,
     const base::FilePath& pref_filename,
     base::SequencedTaskRunner* pref_io_task_runner,
     policy::PolicyService* policy_service,
     ManagedUserSettingsService* managed_user_settings,
     scoped_ptr<PrefHashStore> pref_hash_store,
     const scoped_refptr<PrefStore>& extension_prefs,
@@ skipping 143 matching lines @@
         new InitializeHashStoreObserver(
             pref_store, pref_hash_store.PassAs<PrefHashStore>()));
     pref_store->ReadPrefsAsync(NULL);
   }
 }
 
 void ResetPrefHashStore(const base::FilePath& profile_path) {
   GetPrefHashStoreImpl(profile_path)->Reset();
 }
 
+void RegisterPrefs(PrefRegistrySimple* registry) {
+  // Register the pref that maintains state about the last time a PrefHashFilter
+  // reset event occurred. Used to decide whether to show UI.

[gab, 2014/02/07 22:00:19]

I don't think a comment about what the pref does is necessary; all details
should be on the pref declaration's comment IMO.

[robertshield, 2014/02/10 02:30:53]

Done.

+  registry->RegisterInt64Pref(prefs::kProfilePreferenceResetTime, 0L);
+
+  PrefHashStoreImpl::RegisterPrefs(registry);
+}
+
 }  // namespace chrome_prefs