Reauthenticate the user before launching Smart Lock setup app.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index b8386e8b334e7fae0b584588b23ea819dff02b0b..5e775bc1a07082abb6aefa539f6f9ce89330f052 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -14764,6 +14764,9 @@ Do you accept?
     <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_HARDLOCK_PAIRING_CHANGED" desc="Tooltip text shown on a user's lock screen pod when Easy Unlock feature is enabled for the user, but the pairing data is changed. A password has to be entered to unlock the device.">
       One-time activation: Type your password to activate Chrome Smart Lock. Next time, you can just click your picture.
     </message>
+    <message name="IDS_SMART_LOCK_SCREENLOCK_TOOLTIP_HARDLOCK_REAUTH_USER" desc="Tooltip text shown on a user's lock screen pod to reauthenticate the user before setting up Smart Lock. A password has to be entered to unlock the device.">
+      To set up Chrome Smart Lock, Google needs to make sure it's you--type your password to get started.
+    </message>
     <message name="IDS_EASY_UNLOCK_SCREENLOCK_USER_POD_AUTH_VALUE" desc="Message on lock screen user pod shown in place of password field when Easy Unlock is enabled and a phone that can unlock the Chromebook is detected in proximity.">
       Click to enter
     </message>