aura: Try to make Linux host resize code more reliable.

ui/aura/desktop_host_win.cc

 // Copyright (c) 2011 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 "ui/aura/desktop_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
@@ skipping 88 matching lines @@
   }
 }
 
 }  // namespace
 
 // static
 DesktopHost* DesktopHost::Create(const gfx::Rect& bounds) {
   return new DesktopHostWin(bounds);
 }
 
+// static
+gfx::Size DesktopHost::GetNativeDisplaySize() {
+  return gfx::Size(GetSystemMetrics(SM_CXSCREEN),
+                   GetSystemMetrics(SM_CYSCREEN));
+}
+
 DesktopHostWin::DesktopHostWin(const gfx::Rect& bounds) : desktop_(NULL) {
   Init(NULL, bounds);
   SetWindowText(hwnd(), L"aura::Desktop!");
 }
 
 DesktopHostWin::~DesktopHostWin() {
   DestroyWindow(hwnd());
 }
 
 bool DesktopHostWin::Dispatch(const MSG& msg) {
@@ skipping 80 matching lines @@
 void DesktopHostWin::OnPaint(HDC dc) {
   desktop_->Draw();
   ValidateRect(hwnd(), NULL);
 }
 
 void DesktopHostWin::OnSize(UINT param, const CSize& size) {
   desktop_->OnHostResized(gfx::Size(size.cx, size.cy));
 }
 
 }  // namespace aura