[WIP] ash/extensions: Add experimental extension support for window-management in ash.

ash/wm/window_util.h

Index: ash/wm/window_util.h
diff --git a/ash/wm/window_util.h b/ash/wm/window_util.h
index e994f4d40a5fb8f01655b5d608bcf0fd4383acc7..d267c47087b9612dee62b72464a459b186064bb9 100644
--- a/ash/wm/window_util.h
+++ b/ash/wm/window_util.h
@@ -37,16 +37,16 @@ ASH_EXPORT bool CanActivateWindow(aura::Window* window);
 ASH_EXPORT aura::Window* GetActivatableWindow(aura::Window* window);
 
 // Returns true if |window| is normal or default.
-ASH_EXPORT bool IsWindowNormal(aura::Window* window);
+ASH_EXPORT bool IsWindowNormal(const aura::Window* window);
 
 // Returns true if |window| is in the maximized state.
-ASH_EXPORT bool IsWindowMaximized(aura::Window* window);
+ASH_EXPORT bool IsWindowMaximized(const aura::Window* window);
 
 // Returns true if |window| is minimized.
-ASH_EXPORT bool IsWindowMinimized(aura::Window* window);
+ASH_EXPORT bool IsWindowMinimized(const aura::Window* window);
 
 // Returns true if |window| is in the fullscreen state.
-ASH_EXPORT bool IsWindowFullscreen(aura::Window* window);
+ASH_EXPORT bool IsWindowFullscreen(const aura::Window* window);
 
 // Maximizes |window|, which must not be NULL.
 ASH_EXPORT void MaximizeWindow(aura::Window* window);