Added wm::IsWindowUserPositionable(...) method in window_util.h.

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 383c12f26280bef6e227fa6ba43de99076a255b8..e1240ae22d46d160ba8dc48dd012e555d38890ed 100644
--- a/ash/wm/window_util.h
+++ b/ash/wm/window_util.h
@@ -46,6 +46,9 @@ ASH_EXPORT aura::Window* GetActivatableWindow(aura::Window* window);
 // TODO(oshima): remove this.
 ASH_EXPORT bool IsWindowMinimized(aura::Window* window);
 
+// Returns true if |window|'s location can be controlled by the user.
+ASH_EXPORT bool IsWindowUserPositionable(aura::Window* window);
+
 // Moves the window to the center of the display.
 ASH_EXPORT void CenterWindow(aura::Window* window);