Call ShowRootWindow on NativeWindow's RootWindow to display the window.

content/shell/shell_win.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 "content/shell/shell.h"
 
 #include <commctrl.h>
 #include <fcntl.h>
 #include <io.h>
 #include <windows.h>
@@ skipping 14 matching lines @@
 const int kURLBarHeight = 24;
 
 const int kMaxURLLength = 1024;
 
 }  // namespace
 
 namespace content {
 
 HINSTANCE Shell::instance_handle_;
 
-void Shell::PlatformInitialize() {
+void Shell::PlatformInitialize(const gfx::Size& default_window_size) {
   _setmode(_fileno(stdout), _O_BINARY);
   _setmode(_fileno(stderr), _O_BINARY);
   INITCOMMONCONTROLSEX InitCtrlEx;
   InitCtrlEx.dwSize = sizeof(INITCOMMONCONTROLSEX);
   InitCtrlEx.dwICC  = ICC_STANDARD_CLASSES;
   InitCommonControlsEx(&InitCtrlEx);
   RegisterWindowClass();
 }
 
 void Shell::PlatformExit() {
@@ skipping 230 matching lines @@
 
   return CallWindowProc(shell->default_edit_wnd_proc_, hwnd, message, wParam,
                         lParam);
 }
 
 void Shell::PlatformSetTitle(const string16& text) {
   ::SetWindowText(window_, text.c_str());
 }
 
 }  // namespace content