[Sync] Support receiving early passphrase required information in Sync UI.

chrome/browser/ui/webui/options/sync_setup_handler.cc

Index: chrome/browser/ui/webui/options/sync_setup_handler.cc
diff --git a/chrome/browser/ui/webui/options/sync_setup_handler.cc b/chrome/browser/ui/webui/options/sync_setup_handler.cc
index d4c0352233c9e8df78f7865dc2c17a72c2f75be7..b0e0b6c9030f34f6b92932e0d0855b1fac68d952 100644
--- a/chrome/browser/ui/webui/options/sync_setup_handler.cc
+++ b/chrome/browser/ui/webui/options/sync_setup_handler.cc
@@ -468,10 +468,15 @@ void SyncSetupHandler::HandleShowSetupUI(const ListValue* args) {
 
   // The user is trying to manually load a syncSetup URL.  We should bring up
   // either a login or a configure flow based on the state of sync.
-  if (service->HasSyncSetupCompleted())
-    service->get_wizard().Step(SyncSetupWizard::CONFIGURE);
-  else
+  if (service->HasSyncSetupCompleted()) {
+    if (service->IsPassphraseRequiredForDecryption()) {
+      service->get_wizard().Step(SyncSetupWizard::ENTER_PASSPHRASE);
+    } else {
+      service->get_wizard().Step(SyncSetupWizard::CONFIGURE);
+    }
+  } else {
     service->get_wizard().Step(SyncSetupWizard::GAIA_LOGIN);
+  }
 
   // Show the Sync Setup page.
   scoped_ptr<Value> page(Value::CreateStringValue("syncSetup"));