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..b746c43ff643d2cec497cf46f1d18040f1185f4b 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="Summary for disabled button to sign in to Chrome when signin is disabled by the device administrator.">

[gone, 2017/05/03 20:41:52]

I think you need to ask Shimi about the description string, too.

+          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>