re-re-land of https://codereview.chromium.org/11364053/

ui/views/widget/desktop_aura/desktop_stacking_client.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 "ui/views/widget/desktop_aura/desktop_stacking_client.h"
 
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/views/corewm/compound_event_filter.h"
 #include "ui/views/corewm/input_method_event_filter.h"
 #include "ui/views/widget/desktop_aura/desktop_activation_client.h"
 
 namespace views {
 
 DesktopStackingClient::DesktopStackingClient()
     : window_event_filter_(NULL) {
   aura::client::SetStackingClient(this);
 }
 
 DesktopStackingClient::~DesktopStackingClient() {
   if (window_event_filter_)
     window_event_filter_->RemoveFilter(input_method_filter_.get());
 
   aura::client::SetStackingClient(NULL);
 }
 
-aura::Window* DesktopStackingClient::GetDefaultParent(aura::Window* window,
+aura::Window* DesktopStackingClient::GetDefaultParent(aura::Window* context,
+                                                      aura::Window* window,
                                                       const gfx::Rect& bounds) {
   if (!null_parent_.get())
     CreateNULLParent();
 
   return null_parent_.get();
 }
 
 void DesktopStackingClient::CreateNULLParent() {
   focus_manager_.reset(new aura::FocusManager);
 
@@ skipping 12 matching lines @@
 
   input_method_filter_.reset(new corewm::InputMethodEventFilter);
   input_method_filter_->SetInputMethodPropertyInRootWindow(null_parent_.get());
   window_event_filter_->AddFilter(input_method_filter_.get());
 
   capture_client_.reset(
       new aura::client::DefaultCaptureClient(null_parent_.get()));
 }
 
 }  // namespace views