Adds WmWindow and converts WindowState to use it

ash/wm/workspace/workspace_layout_manager.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 "ash/wm/workspace/workspace_layout_manager.h"
 
 #include <algorithm>
 
 #include "ash/root_window_controller.h"
 #include "ash/screen_util.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/wm/always_on_top_controller.h"
 #include "ash/wm/common/wm_event.h"
 #include "ash/wm/common/workspace/workspace_layout_manager_delegate.h"
 #include "ash/wm/window_animations.h"
 #include "ash/wm/window_positioner.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state.h"
+#include "ash/wm/window_state_aura.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace/workspace_layout_manager_backdrop_delegate.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/layer.h"
 #include "ui/events/event.h"
 #include "ui/gfx/screen.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
@@ skipping 163 matching lines @@
           ? GetRootWindowController(window_->GetRootWindow())
                 ->GetWindowForFullscreenMode()
           : NULL;
   // Changing always on top state may change window's parent. Iterate on a copy
   // of |windows_| to avoid invalidating an iterator. Since both workspace and
   // always_on_top containers' layouts are managed by this class all the
   // appropriate windows will be included in the iteration.
   WindowSet windows(windows_);
   for (auto window : windows) {
     wm::WindowState* window_state = wm::GetWindowState(window);
-    if (is_fullscreen)
-      window_state->DisableAlwaysOnTop(fullscreen_window);
-    else
+    if (is_fullscreen) {
+      window_state->DisableAlwaysOnTop(
+          wm::WmWindowAura::Get(fullscreen_window));
+    } else {
       window_state->RestoreAlwaysOnTop();
+    }
   }
 }
 
 //////////////////////////////////////////////////////////////////////////////
 // WorkspaceLayoutManager, aura::WindowObserver implementation:
 
 void WorkspaceLayoutManager::OnWindowHierarchyChanged(
     const WindowObserver::HierarchyChangeParams& params) {
   if (!wm::GetWindowState(params.target)->IsActive())
     return;
@@ skipping 128 matching lines @@
     return;
   bool is_fullscreen = GetRootWindowController(
       window_->GetRootWindow())->GetWindowForFullscreenMode() != NULL;
   if (is_fullscreen != is_fullscreen_) {
     delegate_->OnFullscreenStateChanged(is_fullscreen);
     is_fullscreen_ = is_fullscreen;
   }
 }
 
 }  // namespace ash