cros: allow aura window not considered activatable for pointer event

ui/wm/core/focus_rules.h

Index: ui/wm/core/focus_rules.h
diff --git a/ui/wm/core/focus_rules.h b/ui/wm/core/focus_rules.h
index cb9a4ddbd8fa5d0d6a59227d19385a3c9031a9ae..1bb9bf90a06111dc398cbee0bdb21b4342eca116 100644
--- a/ui/wm/core/focus_rules.h
+++ b/ui/wm/core/focus_rules.h
@@ -11,6 +11,10 @@ namespace aura {
 class Window;
 }
 
+namespace ui {
+class Event;
+}
+
 namespace wm {
 
 // Implemented by an object that establishes the rules about what can be
@@ -29,6 +33,10 @@ class WM_EXPORT FocusRules {
   // For CanFocusWindow(), NULL is supported, because NULL is a valid focusable
   // window (in the case of clearing focus).
   virtual bool CanFocusWindow(aura::Window* window) const = 0;
+  // Returns true if |window| is considered activatable for the |event|.
+  virtual bool IsWindowConsideredActivatableForEvent(
+      aura::Window* window,
+      ui::Event* event) const = 0;
 
   // Returns the toplevel window containing |window|. Not all toplevel windows
   // are activatable, call GetActivatableWindow() instead to return the