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

chromeos/ime/input_methods.txt

 # The list of keyboard layouts that we support. The keyboard layout metadata is
 # also defined here.
 #
 # Each non-comment line contains the following tab-separated columns.
 #
 # 1) The input method ID used by Chrome. (ex. "xkb:ca::fra") You should *NEVER*
 #    change the ID since the ID might be written in user's ~/Preferences. For
 #    example, three-letter ISO 639-2/B codes are used for IDs start with "xkb:"
 #    for histrical reason, but we should not replace them with two-letter 639-1
 #    codes that are currently in use in the 3rd column.
 # 2) The keyboard layout ID used by XKB. (ex. "us", "us(dvorak)", "ca",
 #    "handwriting-vk,jp"). See also: /usr/share/X11/xkb/symbols.
 # 3) The language code (ex. "fr"). Only one format, ISO 639-1 compliant two-
 #    letter language code which can be recognized by ICU, is allowed. Do not use
 #    three-letter ones (ISO 639-2/T and 639-2/B) here. For "en", "pt", and "zh",
 #    two-letter upper-case country code should be added (ex. "en-US", "zh-TW").
 #    See http://en.wikipedia.org/wiki/List_of_ISO_639-1_codes for details.
 #    We can specify multiple language code with comma separator.
+# 4) The additional attibution.
+#    no-login: Spcified keyboard layout will not be used on login screen or lock
+#              screen.
 #
 # Notes:
 #   When adding a line to this list, please also add a mapping from the input
 #   method ID to the keyboard overlay ID to INPUT_METHOD_ID_TO_OVERLAY_ID in
 #
 #    * tools/gen_keyboard_overlay_data/gen_keyboard_overlay_data.py
 #
 #   and update the following files by running this script.
 #
 #    * chrome/app/generated_resources.grd
 #    * chrome/browser/resources/chromeos/keyboard_overlay_data.js
 #    * chrome/browser/ui/webui/chromeos/keyboard_overlay_ui.cc
 #
 #   If you add an XKB layout which depends on X11's Mod3Mask (e.g. Germany Neo2
 #   XKB layout), you should also update IsMod3UsedByCurrentInputMethod() method
 #   in chrome/browser/ui/ash/event_rewriter.cc. Otherwise, Mod3Mask might be
 #   removed unexpectedly by the rewriter.
 #
-#   If you add a new language such that some of its layouts can be used at
-#   signin screen (e.g. it is "Full Latin Keyboard Layout" therefore allowing
-#   input of gmail password), you should also update
-#   kHasLatinKeyboardLanguageList[] in
-#   chrome/browser/chromeos/input_method/input_method_manager_impl_ll.cc
-#
-#   If you add a new keyboard layout for existing language, please ensure
-#   that information in kHasLatinKeyboardLanguageList[] is still correct.
 
 # U.S. English
-xkb:us::eng     us      en-US,en-AU,id,fil,ms
-xkb:us:intl:eng us(intl)        en-US,nl,pt-BR
-xkb:us:altgr-intl:eng   us(altgr-intl)  en-US
-xkb:us:dvorak:eng       us(dvorak)      en-US
-xkb:us:colemak:eng      us(colemak)     en-US
+xkb:us::eng     us      en-US,en-AU,id,fil,ms login
+xkb:us:intl:eng us(intl)        en-US,nl,pt-BR login
+xkb:us:altgr-intl:eng   us(altgr-intl)  en-US login
+xkb:us:dvorak:eng       us(dvorak)      en-US login
+xkb:us:colemak:eng      us(colemak)     en-US login
 # U.S. English entiries have to be above the Dutch entry so that xkb:us:intl:eng
 # will be selected as the default keyboard when the UI language is set to Dutch.
 
 # Dutch
-xkb:be::nld     be      nl
+xkb:be::nld     be      nl login
 # We don't support xkb:nl::nld. See b/4430951.
 
 # French
-xkb:fr::fra     fr      fr
-xkb:be::fra     be      fr
-xkb:ca::fra     ca      fr
-xkb:ch:fr:fra   ch(fr)  fr
-xkb:ca:multix:fra ca(multix) fr
+xkb:fr::fra     fr      fr login
+xkb:be::fra     be      fr login
+xkb:ca::fra     ca      fr login
+xkb:ch:fr:fra   ch(fr)  fr login
+xkb:ca:multix:fra ca(multix) fr login
 
 # German
-xkb:de::ger     de      de
-xkb:de:neo:ger  de(neo) de
-xkb:be::ger     be      de
-xkb:ch::ger     ch      de
+xkb:de::ger     de      de login
+xkb:de:neo:ger  de(neo) de login
+xkb:be::ger     be      de login
+xkb:ch::ger     ch      de login
 
 # Japanese
 # |kMozcJaInputMethodIds| in ibus_ui_controller.cc should also be updated when
 # a new Mozc Japanese IME for another keyboard layout is added.
-xkb:jp::jpn     jp      ja
+xkb:jp::jpn     jp      ja login
 
 # Russian
 xkb:ru::rus     ru      ru
 xkb:ru:phonetic:rus     ru(phonetic)    ru
 
 # Keyboard layouts.
-xkb:br::por     br      pt-BR
+xkb:br::por     br      pt-BR login
 xkb:bg::bul     bg      bg
 xkb:bg:phonetic:bul     bg(phonetic)    bg
-xkb:ca:eng:eng  ca(eng) en-CA
-xkb:cz::cze     cz      cs
-xkb:cz:qwerty:cze       cz(qwerty)      cs
-xkb:ee::est     ee      et
-xkb:es::spa     es      es
-xkb:es:cat:cat  es(cat) ca
-xkb:dk::dan     dk      da
+xkb:ca:eng:eng  ca(eng) en-CA login
+xkb:cz::cze     cz      cs login
+xkb:cz:qwerty:cze       cz(qwerty)      cs login
+xkb:ee::est     ee      et login
+xkb:es::spa     es      es login
+xkb:es:cat:cat  es(cat) ca login
+xkb:dk::dan     dk      da login
 xkb:gr::gre     gr      el
 xkb:il::heb     il      he
-xkb:latam::spa  latam   es,es-419
-xkb:lt::lit     lt      lt
-xkb:lv:apostrophe:lav   lv(apostrophe)  lv
-xkb:hr::scr     hr      hr
-xkb:gb:extd:eng gb(extd)        en-GB
-xkb:gb:dvorak:eng       gb(dvorak)      en-GB
-xkb:fi::fin     fi      fi
-xkb:hu::hun     hu      hu
-xkb:it::ita     it      it
-xkb:is::ice     is      is
-xkb:no::nob     no      nb
-xkb:pl::pol     pl      pl
-xkb:pt::por     pt      pt-PT
-xkb:ro::rum     ro      ro
-xkb:se::swe     se      sv
+xkb:latam::spa  latam   es,es-419 login
+xkb:lt::lit     lt      lt login
+xkb:lv:apostrophe:lav   lv(apostrophe)  lv login
+xkb:hr::scr     hr      hr login
+xkb:gb:extd:eng gb(extd)        en-GB login
+xkb:gb:dvorak:eng       gb(dvorak)      en-GB login
+xkb:fi::fin     fi      fi login
+xkb:hu::hun     hu      hu login
+xkb:it::ita     it      it login
+xkb:is::ice     is      is login
+xkb:no::nob     no      nb login
+xkb:pl::pol     pl      pl login
+xkb:pt::por     pt      pt-PT login
+xkb:ro::rum     ro      ro login
+xkb:se::swe     se      sv login
 xkb:sk::slo     sk      sk
-xkb:si::slv     si      sl
+xkb:si::slv     si      sl login
 xkb:rs::srp     rs      sr
-xkb:tr::tur     tr      tr
-xkb:ua::ukr     ua      uk
+xkb:tr::tur     tr      tr login
+xkb:ua::ukr     ua      uk login
 xkb:by::bel     by      be
 xkb:am:phonetic:arm     am      hy
 xkb:ge::geo     ge      ka
 xkb:mn::mon     mn      mn
 # TODO(yusukes): Support xkb:latam:deadtilde:spa and/or xkb:latam:nodeadkeys:spa
 # if necessary.