Removes most aura dependencies from WindowResizer

ash/wm/aura/wm_root_window_controller_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_root_window_controller_aura.h"
 
+#include "ash/display/window_tree_host_manager.h"
 #include "ash/root_window_controller.h"
+#include "ash/shell.h"
 #include "ash/wm/aura/wm_globals_aura.h"
+#include "ash/wm/aura/wm_window_aura.h"
 #include "ash/wm/workspace_controller.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_property.h"
 
 DECLARE_WINDOW_PROPERTY_TYPE(ash::wm::WmRootWindowControllerAura*);
 
 namespace ash {
 namespace wm {
 
 // TODO(sky): it likely makes more sense to hang this off RootWindowSettings.
 DEFINE_OWNED_WINDOW_PROPERTY_KEY(ash::wm::WmRootWindowControllerAura,
                                  kWmRootWindowControllerKey,
                                  nullptr);
 
+// static
+WmRootWindowController* WmRootWindowController::GetWithDisplayId(int64_t id) {
+  return WmRootWindowControllerAura::Get(Shell::GetInstance()
+                                             ->window_tree_host_manager()
+                                             ->GetRootWindowForDisplayId(id));
+}
+
 WmRootWindowControllerAura::WmRootWindowControllerAura(
     RootWindowController* root_window_controller)
     : root_window_controller_(root_window_controller) {
   root_window_controller_->GetRootWindow()->SetProperty(
       kWmRootWindowControllerKey, this);
 }
 
 WmRootWindowControllerAura::~WmRootWindowControllerAura() {}
 
 // static
@@ skipping 22 matching lines @@
 }
 
 WmGlobals* WmRootWindowControllerAura::GetGlobals() {
   return WmGlobalsAura::Get();
 }
 
 WorkspaceWindowState WmRootWindowControllerAura::GetWorkspaceWindowState() {
   return root_window_controller_->workspace_controller()->GetWindowState();
 }
 
+WmWindow* WmRootWindowControllerAura::GetWindow() {
+  return WmWindowAura::Get(root_window_controller_->GetRootWindow());
+}
+
 }  // namespace wm
 }  // namespace ash