ash: Take the 24h clock pref into consideration when showing the time.

ash/system/tray/system_tray_delegate.h

 // Copyright (c) 2012 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.
 
 #ifndef ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #pragma once
 
 #include "ash/system/user/login_status.h"
+#include "base/i18n/time_formatting.h"
 #include "base/string16.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 class SkBitmap;
 
 namespace ash {
 
 struct NetworkIconInfo {
   SkBitmap image;
   string16 name;
   string16 description;
 };
 
 class SystemTrayDelegate {
  public:
   virtual ~SystemTrayDelegate() {}
 
   // Gets information about the logged in user.
   virtual const std::string GetUserDisplayName() const = 0;
   virtual const std::string GetUserEmail() const = 0;
   virtual const SkBitmap& GetUserImage() const = 0;
   virtual user::LoginStatus GetUserLoginStatus() const = 0;
 
   // Returns whether a system upgrade is available.
   virtual bool SystemShouldUpgrade() const = 0;
 
   // Returns the resource id for the icon to show for the update notification.
   virtual int GetSystemUpdateIconResource() const = 0;
 
+  // Returns the desired hour clock type.
+  virtual base::HourClockType GetHourClockType() const = 0;
+
   // Shows settings.
   virtual void ShowSettings() = 0;
 
   // Shows the settings related to date, timezone etc.
   virtual void ShowDateSettings() = 0;
 
   // Shows help.
   virtual void ShowHelp() = 0;
 
   // Is the system audio muted?
@@ skipping 19 matching lines @@
 
   // Returns information about the most relevant network. Relevance is
   // determined by the implementor (e.g. a connecting network may be more
   // relevant over a connected network etc.)
   virtual NetworkIconInfo GetMostRelevantNetworkIcon() = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_