Makes RootWindowController window creation in terms of common types

mash/wm/non_client_frame_controller.cc

 // Copyright 2015 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 "mash/wm/non_client_frame_controller.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
@@ skipping 185 matching lines @@
 int NonClientFrameController::GetMaxTitleBarButtonWidth() {
   return NonClientFrameViewMash::GetMaxTitleBarButtonWidth();
 }
 
 NonClientFrameController::NonClientFrameController(
     shell::Connector* connector,
     mus::Window* parent,
     mus::Window* window,
     mus::WindowManagerClient* window_manager_client)
     : widget_(new views::Widget), window_(window) {
-  WmWindowMus::Get(window)->set_widget(
-      widget_, WmWindowMus::WidgetCreationType::FOR_CLIENT);
+  WmWindowMus* wm_window = WmWindowMus::Get(window);
+  wm_window->set_widget(widget_, WmWindowMus::WidgetCreationType::FOR_CLIENT);
   window_->AddObserver(this);
 
   // To simplify things this code creates a Widget. While a Widget is created
   // we need to ensure we don't inadvertently change random properties of the
   // underlying mus::Window. For example, showing the Widget shouldn't change
   // the bounds of the mus::Window in anyway.
   views::Widget::InitParams params(views::Widget::InitParams::TYPE_WINDOW);
   // We initiate focus at the mus level, not at the views level.
   params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
   params.delegate = this;
   params.native_widget =
       new WmNativeWidgetMus(widget_, connector, window, window_manager_client);
   widget_->Init(params);
 
   parent->AddChild(window);
 
   widget_->ShowInactive();
 
   const int shadow_inset =
       Shadow::GetInteriorInsetForStyle(Shadow::STYLE_ACTIVE);
+  const gfx::Insets extended_hit_region =
+      wm_window->ShouldUseExtendedHitRegion()
+          ? FrameBorderHitTestController::GetResizeOutsideBoundsSize()
+          : gfx::Insets();
   window_manager_client->SetUnderlaySurfaceOffsetAndExtendedHitArea(
-      window, gfx::Vector2d(shadow_inset, shadow_inset),
-      FrameBorderHitTestController::GetResizeOutsideBoundsSize());
+      window, gfx::Vector2d(shadow_inset, shadow_inset), extended_hit_region);
 }
 
 NonClientFrameController::~NonClientFrameController() {
   if (window_)
     window_->RemoveObserver(this);
 }
 
 base::string16 NonClientFrameController::GetWindowTitle() const {
   if (!window_->HasSharedProperty(
           mus::mojom::WindowManager::kWindowTitle_Property)) {
@@ skipping 63 matching lines @@
   }
 }
 
 void NonClientFrameController::OnWindowDestroyed(mus::Window* window) {
   window_->RemoveObserver(this);
   window_ = nullptr;
 }
 
 }  // namespace wm
 }  // namespace mash