Added a timezone policy and pyauto tests for it.

chrome/browser/automation/testing_automation_provider_chromeos.cc

Index: chrome/browser/automation/testing_automation_provider_chromeos.cc
diff --git a/chrome/browser/automation/testing_automation_provider_chromeos.cc b/chrome/browser/automation/testing_automation_provider_chromeos.cc
index 000677fc80e57fb1a11be389e342e0de3872166a..9d69986134a9524c6e8483f86ffe50c7427ac67b 100644
--- a/chrome/browser/automation/testing_automation_provider_chromeos.cc
+++ b/chrome/browser/automation/testing_automation_provider_chromeos.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/chromeos/audio/audio_handler.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
+#include "chrome/browser/chromeos/cros_settings.h"
 #include "chrome/browser/chromeos/login/default_user_images.h"
 #include "chrome/browser/chromeos/login/enrollment/enterprise_enrollment_screen.h"
 #include "chrome/browser/chromeos/login/eula_screen.h"
@@ -1427,7 +1428,7 @@ void TestingAutomationProvider::SetMute(DictionaryValue* args,
 }
 
 void TestingAutomationProvider::OpenCrosh(DictionaryValue* args,
-                                        IPC::Message* reply_message) {
+                                          IPC::Message* reply_message) {
   new NavigationNotificationObserver(
       NULL, this, reply_message, 1, false, true);
   ash::Shell::GetInstance()->delegate()->OpenCrosh();
@@ -1450,6 +1451,20 @@ void TestingAutomationProvider::CaptureProfilePhoto(
   window->Show();
 }
 
+void TestingAutomationProvider::SetCrosSetting(base::DictionaryValue* args,
+                                               IPC::Message* reply_message) {
+  AutomationJSONReply reply(this, reply_message);
+  std::string path;
+  base::Value* val;
+  if (!args->GetString("path", &path) || !args->Get("value", &val)) {
+    reply.SendError("Invalid or missing args.");
+    return;
+  }
+  chromeos::CrosSettings* settings = chromeos::CrosSettings::Get();
+  settings->Set(path, *val);
+  reply.SendSuccess(NULL);
+}
+
 void TestingAutomationProvider::AddChromeosObservers() {
   power_manager_observer_ = new PowerManagerClientObserverForTesting;
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->