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

ui/aura/desktop_host_win.cc

Index: ui/aura/desktop_host_win.cc
diff --git a/ui/aura/desktop_host_win.cc b/ui/aura/desktop_host_win.cc
index 0dabcdda83c137ba33b19e3bfe1583b6607a6aec..c123890e24a9744972cf1583f31df39d6c2e5ccb 100644
--- a/ui/aura/desktop_host_win.cc
+++ b/ui/aura/desktop_host_win.cc
@@ -106,6 +106,12 @@ 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!");