Revamped signin/sync error surfacing on desktop user menu

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 5fe470853ddc68ed3aec6f0a378c3afab482949c..e21b65e4281a53277290b338c88d6d9b2a0604dc 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -11492,6 +11492,33 @@ Some features may be unavailable.  Please check that the profile exists and you
       <message name="IDS_SYNC_ERROR_BUBBLE_VIEW_TITLE" desc="Title in the sync error bubble view/notification.">
         Sync Error
       </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_TITLE" desc="Title of the sync/signin error header of desktop user menu.">
+        Sync isn't working
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_SIGNIN_MESSAGE" desc="Message of the out-of-date signin info error in the header of desktop user menu.">
+        Sign-in details are out of date.
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_SIGNIN_BUTTON" desc="Button in the header of desktop user menu that prompts the user to sign in again to fix the out-of-date signin info error.">
+        Sign in again
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_PASSPHRASE_MESSAGE" desc="Message of the out-of-date sync passphrase error in the header of desktop user menu.">
+        Passphrase required to start sync.
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_PASSPHRASE_BUTTON" desc="Button in the header of desktop user menu that prompts the user to enter the sync passphrase to fix the out-of-date passphrase error.">
+        Enter passphrase
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_SIGNIN_AGAIN_MESSAGE" desc="Message of the unrecoverable error in the header of desktop user menu.">
+        Try signing in again.
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_SIGNIN_AGAIN_BUTTON" desc="Button in the header of desktop user menu that signs out and signs back in in an attempt to resolve an unrecoverable error.">
+        Sign in again
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_SIGNOUT_MESSAGE" desc="Message of the unrecoverable error in the header of desktop user menu for managed users.">
+        Try signing out and back in again.
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_SIGNOUT_BUTTON" desc="Button in the header of desktop user menu for managed users to sign out in an attempt to resolve an unrecoverable error.">
+        Sign out
+      </message>
       <if expr="use_ash">
         <message name="IDS_SYNC_NOTIFICATION_ACCEPT" desc="A button label shown in the sync error notification when the passphrase needs to be updated.">
           Update sync passphrase