Add Easy Unlock options to chrome://settings behind a flag.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 1563 matching lines @@
   </message>
   <message name="IDS_LOGIN_OOBE_HELP_DIALOG_TITLE" desc="Default title for help dialogs during OOBE/login">
     Help
   </message>
   <message name="IDS_LOGIN_CAPTCHA_DIALOG_TITLE" desc="Title shown for captcha input dialog">
     Sign in
   </message>
   <message name="IDS_LOGIN_CAPTCHA_INSTRUCTIONS" desc="Explanatory message shown when the user must type letters shown in a captcha image to reauthenticate.">
     Type the characters you see in the picture below.
   </message>
+  <message name="IDS_OPTIONS_EASY_UNLOCK_CHECKBOX_LABEL_CHROMEOS" desc="The label beside the checkbox to enable or disable easy unlock. This is the ChromeOS specific label.">
+    Enable Easy Unlock for this <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph>.
+  </message>
   <message name="IDS_OPTIONS_SETTINGS_SECONDARY_USER_BANNER" desc="Banner displayed in settings page when the user is secondary in a multi-profile session.">
     Some settings belonging to <ph name="PRIMARY_EMAIL">$1<ex>john@google.com</ex></ph> are being shared with you. These settings only affect your account when using multiple sign-in.
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_DATETIME">
     Date and time
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_WIRED_NETWORK" desc="Title for section in settings/internet for list of wired networks (usually one)">
     Wired network
   </message>
   <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_WIRELESS_NETWORK" desc="Title for section in settings/internet for list of wireless networks (wifi and cellular)">
@@ skipping 3712 matching lines @@
     Failed to set adapter power.
   </message>
   <message name="IDS_NFC_DEBUG_ERROR_FAILED_TO_SET_POLLING" desc="Error message shown when polling state could not be set." translateable="false">
     Failed to start/stop polling.
   </message>
   <message name="IDS_NFC_DEBUG_ERROR_FAILED_TO_SUBMIT_PREFIX" desc="Error message shown when an NDEF form could not be submitted." translateable="false">
     Failed to submit NDEF:
   </message>
 
 </grit-part>