ChromeOS: implement per-user time zone preferences.

chrome/test/base/testing_profile.h

Index: chrome/test/base/testing_profile.h
diff --git a/chrome/test/base/testing_profile.h b/chrome/test/base/testing_profile.h
index 5d9bd8a748a41176273dafb16a9e0dea4476b96a..ba7875475419e98606600bf7473a5a40acd34984 100644
--- a/chrome/test/base/testing_profile.h
+++ b/chrome/test/base/testing_profile.h
@@ -19,6 +19,11 @@
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 #include "extensions/features/features.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/settings/cros_settings.h"
+#include "chrome/browser/chromeos/settings/device_settings_service.h"
+#endif
+
 class BrowserContextDependencyManager;
 class ExtensionSpecialStoragePolicy;
 class HostContentSettingsMap;
@@ -430,6 +435,12 @@ class TestingProfile : public Profile {
 
   std::string profile_name_;
 
+#if defined(OS_CHROMEOS)
+  std::unique_ptr<chromeos::ScopedTestDeviceSettingsService>
+      test_device_settings_;
+  std::unique_ptr<chromeos::ScopedTestCrosSettings> test_cros_settings_;
+#endif  // defined(OS_CHROMEOS)
+
   std::unique_ptr<policy::PolicyService> policy_service_;
 };