Add context to gfx::Screen calls in support of simultaneous desktop+ash

chrome/browser/ui/ash/ash_util.cc

Index: chrome/browser/ui/ash/ash_util.cc
diff --git a/chrome/browser/ui/ash/ash_util.cc b/chrome/browser/ui/ash/ash_util.cc
index 488cc4c3f8cef178575b9d5369410285ff35d061..0c40be8217827bf5aca234b9336570688a3d32e5 100644
--- a/chrome/browser/ui/ash/ash_util.cc
+++ b/chrome/browser/ui/ash/ash_util.cc
@@ -7,6 +7,7 @@
 #include "ash/shell.h"
 #include "chrome/browser/ui/ash/ash_init.h"
 #include "ui/aura/root_window.h"
+#include "ui/gfx/screen.h"
 
 namespace chrome {
 
@@ -36,6 +37,7 @@ bool IsNativeWindowInAsh(gfx::NativeWindow native_window) {
 }
 
 void ToggleAshDesktop() {
+  // TODO(scottmg): Probably need to force Ash here. http://crbug.com/133312
   if (!ash::Shell::HasInstance())
     OpenAsh();
   else