Disable VK overscroll for login/out-of-box.

chrome/browser/chromeos/login/helper.cc

 // Copyright (c) 2012 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/chromeos/login/helper.h"
 
 #include "ash/shell.h"
+#include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/login/users/user_manager.h"
+#include "chromeos/chromeos_switches.h"
 #include "chromeos/network/network_handler.h"
 #include "chromeos/network/network_state.h"
 #include "chromeos/network/network_state_handler.h"
 #include "chromeos/network/shill_property_util.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 23 matching lines @@
 }
 
 namespace login {
 
 std::string CanonicalizeUserID(const std::string& user_id) {
   if (user_id == UserManager::kGuestUserName)
     return user_id;
   return gaia::CanonicalizeEmail(user_id);
 }
 
+bool LoginScrollIntoViewEnabled() {
+  return !CommandLine::ForCurrentProcess()->HasSwitch(
+      chromeos::switches::kDisableLoginScrollIntoView);
+}
+
 NetworkStateHelper::NetworkStateHelper() {}
 NetworkStateHelper::~NetworkStateHelper() {}
 
 base::string16 NetworkStateHelper::GetCurrentNetworkName() const {
   NetworkStateHandler* nsh = NetworkHandler::Get()->network_state_handler();
   const NetworkState* network =
       nsh->ConnectedNetworkByType(NetworkTypePattern::NonVirtual());
   if (network) {
     if (network->Matches(NetworkTypePattern::Ethernet()))
       return l10n_util::GetStringUTF16(IDS_STATUSBAR_NETWORK_DEVICE_ETHERNET);
@@ skipping 19 matching lines @@
 bool NetworkStateHelper::IsConnecting() const {
   chromeos::NetworkStateHandler* nsh =
       chromeos::NetworkHandler::Get()->network_state_handler();
   return nsh->ConnectingNetworkByType(
       chromeos::NetworkTypePattern::Default()) != NULL;
 }
 
 }  // namespace login
 
 }  // namespace chromeos