Fullscreen backdrop window for maximize mode

ash/common/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/common/wm/workspace/workspace_layout_manager.h"
 
 #include <algorithm>
 
 #include "ash/common/keyboard/keyboard_observer_register.h"
 #include "ash/common/session/session_controller.h"
@@ skipping 278 matching lines @@
     const display::Display& display,
     uint32_t changed_metrics) {
   if (window_->GetDisplayNearestWindow().id() != display.id())
     return;
 
   const gfx::Rect work_area(wm::GetDisplayWorkAreaBoundsInParent(window_));
   if (work_area != work_area_in_parent_) {
     const wm::WMEvent event(wm::WM_EVENT_WORKAREA_BOUNDS_CHANGED);
     AdjustAllWindowsBoundsForWorkAreaChange(&event);
   }
-  if (backdrop_delegate_)
-    backdrop_delegate_->OnDisplayWorkAreaInsetsChanged();
 }
 
 //////////////////////////////////////////////////////////////////////////////
 // WorkspaceLayoutManager, ShellObserver implementation:
 
 void WorkspaceLayoutManager::OnFullscreenStateChanged(bool is_fullscreen,
                                                       WmWindow* root_window) {
   if (root_window != root_window_ || is_fullscreen_ == is_fullscreen)
     return;
 
@@ skipping 85 matching lines @@
   for (auto* window : windows) {
     wm::WindowState* window_state = window->GetWindowState();
     if (window_on_top)
       window_state->DisableAlwaysOnTop(window_on_top);
     else
       window_state->RestoreAlwaysOnTop();
   }
 }
 
 }  // namespace ash