Disable non Latin keyboard layout on Lock screen and Sign-in screen.

chromeos/ime/input_method_descriptor.h

 // Copyright 2013 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 CHROMEOS_IME_INPUT_METHOD_DESCRIPTOR_H_
 #define CHROMEOS_IME_INPUT_METHOD_DESCRIPTOR_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "chromeos/chromeos_export.h"
 #include "url/gurl.h"
 
 namespace chromeos {
 namespace input_method {
 
 // A structure which represents an input method.
 class CHROMEOS_EXPORT InputMethodDescriptor {
  public:
   InputMethodDescriptor();
   InputMethodDescriptor(const std::string& id,
                         const std::string& name,
                         const std::vector<std::string>& keyboard_layouts,
                         const std::vector<std::string>& language_codes,
+                        bool is_login_keyboard,
                         const GURL& options_page_url);
   ~InputMethodDescriptor();
 
   // Accessors
   const std::string& id() const { return id_; }
   const std::string& name() const { return name_; }
   const std::vector<std::string>& language_codes() const {
     return language_codes_;
   }
   const GURL& options_page_url() const { return options_page_url_; }
   const std::vector<std::string>& keyboard_layouts() const {
     return keyboard_layouts_;
   }
 
+  bool is_login_keyboard() const { return is_login_keyboard_; }
+
   // Returns preferred keyboard layout.
   std::string GetPreferredKeyboardLayout() const;
 
  private:
   // An ID that identifies an input method engine (e.g., "t:latn-post",
   // "pinyin", "hangul").
   std::string id_;
 
   // A name used to specify the user-visible name of this input method.  It is
   // only used by extension IMEs, and should be blank for internal IMEs.
   std::string name_;
 
   // A preferred physical keyboard layout for the input method (e.g., "us",
   // "us(dvorak)", "jp"). Comma separated layout names do NOT appear.
   std::vector<std::string> keyboard_layouts_;
 
   // Language code like "ko", "ja", "en-US", and "zh-CN".
   std::vector<std::string> language_codes_;
 
+  // True if this input method can be used on login screen.
+  bool is_login_keyboard_;
+
   // Options page URL e.g.
   // "chrome-extension://ceaajjmckiakobniehbjpdcidfpohlin/options.html".
   // We can't use GURL here due to dependency policy. This field is valid only
   // for input method extension.
   GURL options_page_url_;
 };
 
 typedef std::vector<InputMethodDescriptor> InputMethodDescriptors;
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // CHROMEOS_IME_INPUT_METHOD_DESCRIPTOR_H_