ChromeOS: implement per-user time zone preferences.

chrome/test/base/testing_profile.cc

Index: chrome/test/base/testing_profile.cc
diff --git a/chrome/test/base/testing_profile.cc b/chrome/test/base/testing_profile.cc
index c43d29fdee2dbfb04d59119c832b39124fcdedb7..1e3948f41a00160ee2c21290073f00e4a180bb50 100644
--- a/chrome/test/base/testing_profile.cc
+++ b/chrome/test/base/testing_profile.cc
@@ -426,6 +426,14 @@ void TestingProfile::Init() {
              content::BrowserThread::UI) ||
          content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
+#if defined(OS_CHROMEOS)
+  if (!chromeos::DeviceSettingsService::IsInitialized())
+    test_device_settings_.reset(new chromeos::ScopedTestDeviceSettingsService);
+
+  if (!chromeos::CrosSettings::IsInitialized())
+    test_cros_settings_.reset(new chromeos::ScopedTestCrosSettings);
+#endif
+
   set_is_guest_profile(guest_session_);
 
   BrowserContext::Initialize(this, profile_path_);