Sync Promo: Add a way to collapse the sync promo

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

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/webui/options/options_sync_setup_handler.h"
+
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/sync/profile_sync_service.h"
+
+void OptionsSyncSetupHandler::ShowSetupUI() {
+  ProfileSyncService* service =
+      web_ui_->GetProfile()->GetProfileSyncService();
+  DCHECK(service);
+
+  // If the wizard is already visible, focus it.
+  if (service->get_wizard().IsVisible()) {
+    web_ui_->CallJavascriptFunction("OptionsPage.closeOverlay");
+    service->get_wizard().Focus();
+    return;
+  }
+
+  // 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
+    service->get_wizard().Step(SyncSetupWizard::GAIA_LOGIN);
+
+  // Show the Sync Setup page.
+  scoped_ptr<Value> page(Value::CreateStringValue("syncSetup"));
+  web_ui_->CallJavascriptFunction("OptionsPage.navigateToPage", *page);
+}