Fleshes out the basic set of focus rules a bit more.

ui/views/corewm/window_modality_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_COREWM_WINDOW_MODALITY_CONTROLLER_H_
 #define UI_VIEWS_COREWM_WINDOW_MODALITY_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "ui/aura/env_observer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/events/event_handler.h"
 #include "ui/views/views_export.h"
 
 namespace ui {
 class LocatedEvent;
 }
 
 namespace views {
 namespace corewm {
 
 // Sets the modal parent for the child.
 VIEWS_EXPORT void SetModalParent(aura::Window* child, aura::Window* parent);
 
 // Returns the modal transient child of |window|, or NULL if |window| does not
 // have any modal transient children.
 VIEWS_EXPORT aura::Window* GetModalTransient(aura::Window* window);
+// |activatable| must be activatable.
+aura::Window* GetModalTransientForActivatableWindow(aura::Window* activatable);
 
 // WindowModalityController is an event filter that consumes events sent to
 // windows that are the transient parents of window-modal windows. This filter
 // must be added to the CompoundEventFilter so that activation works properly.
 class VIEWS_EXPORT WindowModalityController : public ui::EventHandler,
                                               public aura::EnvObserver,
                                               public aura::WindowObserver {
  public:
   WindowModalityController();
   virtual ~WindowModalityController();
@@ skipping 19 matching lines @@
 
   std::vector<aura::Window*> windows_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowModalityController);
 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_WINDOW_MODALITY_CONTROLLER_H_