Removes ash::mus::RootWindowController

ash/mus/screen_mus.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/mus/screen_mus.h"
 
+#include "services/ui/public/interfaces/display/display_controller.mojom.h"
 #include "ui/aura/env.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 
-ScreenMus::ScreenMus() = default;
+ScreenMus::ScreenMus(display::mojom::DisplayController* display_controller)
+    : display_controller_(display_controller) {}
 
 ScreenMus::~ScreenMus() = default;
 
+void ScreenMus::SetWorkAreaInsets(aura::Window* window,
+                                  const gfx::Insets& insets) {
+  // If we are not the active instance assume we're in shutdown, and ignore.
+  if (display::Screen::GetScreen() != this)
+    return;
+
+  display::Display old_display = GetDisplayNearestWindow(window);
+  display::Display new_display = old_display;
+  new_display.UpdateWorkAreaFromInsets(insets);
+  if (old_display.work_area() == new_display.work_area())
+    return;
+
+  display_list().UpdateDisplay(new_display);
+  if (display_controller_) {
+    display_controller_->SetDisplayWorkArea(
+        new_display.id(), new_display.bounds().size(), insets);
+  }
+}
+
 display::Display ScreenMus::GetDisplayNearestWindow(
     aura::Window* window) const {
   const aura::WindowTreeHost* host = window->GetHost();
   if (!host)
     return GetPrimaryDisplay();
   auto iter = display_list().FindDisplayById(
       static_cast<const aura::WindowTreeHostMus*>(host)->display_id());
   return iter == display_list().displays().end() ? GetPrimaryDisplay() : *iter;
 }
 
 gfx::Point ScreenMus::GetCursorScreenPoint() {
   return aura::Env::GetInstance()->last_mouse_location();
 }
 
 }  // namespace ash