[cros] Add --stub-cros-settings option for testing.

chrome/browser/ui/webui/options/chromeos/system_settings_provider.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/ui/webui/options/chromeos/system_settings_provider.h"
 
 #include <string>
 
 #include "base/i18n/rtl.h"
 #include "base/lazy_instance.h"
@@ skipping 165 matching lines @@
     zone_id_str.erase(0, slash_pos + 1);
   // zone id has '_' in place of ' '.
   ReplaceSubstringsAfterOffset(&zone_id_str, 0, "_", " ");
   return ASCIIToUTF16(zone_id_str);
 }
 
 }  // namespace anonymous
 
 namespace chromeos {
 
-SystemSettingsProvider::SystemSettingsProvider() {
+SystemSettingsProvider::SystemSettingsProvider(
+    const NotifyObserversCallback& notify_cb)
+    : CrosSettingsProvider(notify_cb) {
   for (size_t i = 0; i < arraysize(kTimeZones); i++) {
     timezones_.push_back(icu::TimeZone::createTimeZone(
         icu::UnicodeString(kTimeZones[i], -1, US_INV)));
   }
   system::TimezoneSettings::GetInstance()->AddObserver(this);
   timezone_value_.reset(base::Value::CreateStringValue(GetKnownTimezoneID(
       system::TimezoneSettings::GetInstance()->GetTimezone())));
 }
 
 SystemSettingsProvider::~SystemSettingsProvider() {
@@ skipping 38 matching lines @@
 
 void SystemSettingsProvider::Reload() {
   // TODO(pastarmovj): We can actually cache the timezone here to make returning
   // it faster.
 }
 
 void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
   // Fires system setting change notification.
   timezone_value_.reset(
       base::Value::CreateStringValue(GetKnownTimezoneID(timezone)));
-  CrosSettings::Get()->FireObservers(kSystemTimezone);
+  NotifyObservers(kSystemTimezone);
 }
 
 ListValue* SystemSettingsProvider::GetTimezoneList() {
   ListValue* timezoneList = new ListValue();
   for (std::vector<icu::TimeZone*>::iterator iter = timezones_.begin();
        iter != timezones_.end(); ++iter) {
     const icu::TimeZone* timezone = *iter;
     ListValue* option = new ListValue();
     option->Append(Value::CreateStringValue(GetTimezoneID(*timezone)));
     option->Append(Value::CreateStringValue(GetTimezoneName(*timezone)));
@@ skipping 66 matching lines @@
     const icu::TimeZone* known_timezone = *iter;
     if (known_timezone->hasSameRules(timezone))
       return GetTimezoneID(*known_timezone);
   }
 
   // Not able to find a matching timezone in our list.
   return string16();
 }
 
 }  // namespace chromeos