Removes most of aura dependencies from DefaultState

ash/wm/common/wm_globals.h

Index: ash/wm/common/wm_globals.h
diff --git a/ash/wm/common/wm_globals.h b/ash/wm/common/wm_globals.h
index 7c977230fc9b41262d456b2536481df1177b7cf2..9343281d2738297f84e026464b528e2925471b1c 100644
--- a/ash/wm/common/wm_globals.h
+++ b/ash/wm/common/wm_globals.h
@@ -5,6 +5,8 @@
 #ifndef ASH_WM_COMMON_WM_GLOBALS_H_
 #define ASH_WM_COMMON_WM_GLOBALS_H_
 
+#include <stdint.h>
+
 #include <vector>
 
 #include "ash/ash_export.h"
@@ -29,6 +31,9 @@ class ASH_EXPORT WmGlobals {
 
   virtual WmWindow* GetActiveWindow() = 0;
 
+  // Returns the root window for the specified display.
+  virtual WmWindow* GetRootWindowForDisplayId(int64_t display_id) = 0;
+
   // Returns the root window that newly created windows should be added to.
   // NOTE: this returns the root, newly created window should be added to the
   // appropriate container in the returned window.