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

chromeos/ime/input_method_descriptor.h

Index: chromeos/ime/input_method_descriptor.h
diff --git a/chromeos/ime/input_method_descriptor.h b/chromeos/ime/input_method_descriptor.h
index c410719c393407678aaf8dd2b8c6526309847802..32f3de9721e8013087c9ff2ad8ad56e35b306b91 100644
--- a/chromeos/ime/input_method_descriptor.h
+++ b/chromeos/ime/input_method_descriptor.h
@@ -23,6 +23,7 @@ class CHROMEOS_EXPORT InputMethodDescriptor {
                         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();
 
@@ -37,6 +38,8 @@ class CHROMEOS_EXPORT InputMethodDescriptor {
     return keyboard_layouts_;
   }
 
+  bool is_login_keyboard() const { return is_login_keyboard_; }
+
   // Returns preferred keyboard layout.
   std::string GetPreferredKeyboardLayout() const;
 
@@ -56,6 +59,9 @@ class CHROMEOS_EXPORT InputMethodDescriptor {
   // 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