mash: Add SystemTrayClient interface, use to show date settings

chrome/browser/ui/ash/system_tray_common.cc

Index: chrome/browser/ui/ash/system_tray_common.cc
diff --git a/chrome/browser/ui/ash/system_tray_common.cc b/chrome/browser/ui/ash/system_tray_common.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d1be323396aa89b232b1393fa77e5b16f055b2d4
--- /dev/null
+++ b/chrome/browser/ui/ash/system_tray_common.cc
@@ -0,0 +1,23 @@
+// Copyright 2016 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/ash/system_tray_common.h"
+
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/chrome_pages.h"
+#include "chrome/common/url_constants.h"
+#include "chrome/grit/generated_resources.h"
+#include "content/public/browser/user_metrics.h"
+#include "ui/base/l10n/l10n_util.h"
+
+// static
+void SystemTrayCommon::ShowDateSettings() {
+  content::RecordAction(base::UserMetricsAction("ShowDateOptions"));
+  std::string sub_page =
+      std::string(chrome::kSearchSubPage) + "#" +
+      l10n_util::GetStringUTF8(IDS_OPTIONS_SETTINGS_SECTION_TITLE_DATETIME);
+  // Everybody can change the time zone (even though it is a device setting).
+  chrome::ShowSettingsSubPageForProfile(ProfileManager::GetActiveUserProfile(),
+                                        sub_page);
+}