Cache a screen compatible DC to avoid re-creating it excessively.

ui/views/widget/native_widget_win.cc

Index: ui/views/widget/native_widget_win.cc
===================================================================
--- ui/views/widget/native_widget_win.cc	(revision 120215)
+++ ui/views/widget/native_widget_win.cc	(working copy)
@@ -1313,6 +1313,7 @@
 }
 
 void NativeWidgetWin::OnDisplayChange(UINT bits_per_pixel, CSize screen_size) {
+  gfx::Screen::ReleaseCompatibleDC();

[sky, 2012/02/03 18:34:06]

This isn't the right place for a release, and it doesn't cover win aura. Instead
create a singleton window that listens for this sort of thing. I want to say we
have such an object some where (ProcessSingleton is a bit similar), but I
couldn't readily locate it.

   GetWidget()->widget_delegate()->OnDisplayChanged();
 }