Converts DockedWindowLayoutManager to use WmRootWindowControllerObserver

ash/wm/aura/wm_window_aura.cc

 // Copyright 2016 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 "ash/wm/aura/wm_window_aura.h"
 
 #include "ash/screen_util.h"
 #include "ash/wm/aura/aura_layout_manager_adapter.h"
 #include "ash/wm/aura/wm_globals_aura.h"
 #include "ash/wm/aura/wm_root_window_controller_aura.h"
@@ skipping 343 matching lines @@
 }
 
 ui::WindowShowState WmWindowAura::GetShowState() const {
   return window_->GetProperty(aura::client::kShowStateKey);
 }
 
 void WmWindowAura::SetRestoreShowState(ui::WindowShowState show_state) {
   window_->SetProperty(aura::client::kRestoreShowStateKey, show_state);
 }
 
+void WmWindowAura::SetLockedToRoot(bool value) {
+  window_->SetProperty(kStayInSameRootWindowKey, value);
+}
+
 void WmWindowAura::SetCapture() {
   window_->SetCapture();
 }
 
 bool WmWindowAura::HasCapture() {
   return window_->HasCapture();
 }
 
 void WmWindowAura::ReleaseCapture() {
   window_->ReleaseCapture();
@@ skipping 157 matching lines @@
 }
 
 void WmWindowAura::OnWindowVisibilityChanging(aura::Window* window,
                                               bool visible) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_,
                     OnWindowVisibilityChanging(this, visible));
 }
 
 }  // namespace wm
 }  // namespace ash