Safety check: added a string for displaying password check progress

Bug: 1015841
Change-Id: Ib2283cc37b3b4b3b06ae2f24a20249d35ae33f73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120475Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Andrey Zaytsev <andzaytsev@google.com>
Cr-Commit-Position: refs/heads/master@{#753308}

chrome/app/settings_strings.grdp

@@ -1668,6 +1668,9 @@
   <message name="IDS_SETTINGS_SAFETY_CHECK_PASSWORDS_PRIMARY_LABEL" desc="'Passwords' is an element in safety check that allows users to check for their passwords being compromised.">
     Passwords
   </message>
+  <message name="IDS_SETTINGS_SAFETY_CHECK_PASSWORDS_PROGRESS" desc="This text describes the progress of the safety check password check.">
+    <ph name="DONE">$1<ex>3</ex></ph>/<ph name="TOTAL">$2<ex>20</ex></ph> passwords checked...
+  </message>
   <message name="IDS_SETTINGS_SAFETY_CHECK_PASSWORDS_SAFE" desc="This text points out that the safety check password check has not found any compromised passwords.">
     No compromised passwords found
   </message>