Show special string in SignInPreference summary when signin is disabled

chrome/android/java/strings/android_chrome_strings.grd

Index: chrome/android/java/strings/android_chrome_strings.grd
diff --git a/chrome/android/java/strings/android_chrome_strings.grd b/chrome/android/java/strings/android_chrome_strings.grd
index 4463a6515c73b29a04cf0e8e8551332e65fadd9b..3f6e60c1a8eefdae3555999cf921bef795a9b826 100644
--- a/chrome/android/java/strings/android_chrome_strings.grd
+++ b/chrome/android/java/strings/android_chrome_strings.grd
@@ -270,6 +270,9 @@ CHAR-LIMIT guidelines:
       <message name="IDS_SIGN_IN_TO_CHROME_SUMMARY" desc="Summary for the button to sign in to Chrome, explaining benefits of signing in.">
         Sign in to get your bookmarks, history, passwords, and other settings on all your devices
       </message>
+      <message name="IDS_SIGN_IN_TO_CHROME_DISABLED_SUMMARY" desc="A descriptive line of text that appears under the 'Sign in to Chrome' option, in Chrome Settings on Android. The text explains why 'Sign in to Chrome' is disabled. 'Administrator' refers to the IT administrator of the company/organization that owns the user’s device.">
+          Disabled by the administrator of this device
+      </message>
       <message name="IDS_SIGN_IN_GOOGLE_ACTIVITY_CONTROLS" desc="Title of Google activity controls preference in signed in accounts settings screen">
         Google Activity Controls
       </message>