ARC: Add strings for opt-in related to location services

BUG=b:29824233

Review-Url: https://codereview.chromium.org/2109213004
Cr-Commit-Position: refs/heads/master@{#403333}

chrome/app/chromeos_strings.grdp

@@ -6710,6 +6710,12 @@ All users must sign out to continue.
   <message name="IDS_ARC_OPT_IN_DIALOG_BACKUP_RESTORE" desc="Message in the opt-in dialog for users to enable Backup and Restore for Android apps.">
     Automatically back up and restore Play app data to Google Drive. You can change this in Android Settings at any time. <ph name="BEGIN_LINK1">&lt;a href="#" id="learn-more-link-backup-restore"&gt;</ph>Learn More<ph name="END_LINK1">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
   </message>
+  <message name="IDS_ARC_OPT_IN_LOCATION_SETTING" desc="Message in the opt-in dialog for Android apps for the user to turn on Google location services">
+    Let Google’s location service help apps find your location quickly and accurately, which can reduce battery consumption. Anonymous location data will be sent to Google, even when no apps are running.
+  </message>
+  <message name="IDS_ARC_OPT_IN_SCANNING_SETTING" desc="Message in the opt-in dialog for Android apps for the user to enable wifi and bluetooth scanning to improve location">
+    Improve location accuracy by allowing apps and services to scan for Wi-Fi networks and Bluetooth devices.
+  </message>
   <message name="IDS_ARC_OPT_OUT_TAB_TITLE" desc="Tab title when viewing opt-out setting dialog for android apps.">
     Settings - Remove Android apps
   </message>