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

ui/views/corewm/base_focus_rules.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_BASE_FOCUS_RULES_H_
 #define UI_VIEWS_COREWM_BASE_FOCUS_RULES_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/corewm/focus_rules.h"
 
 namespace views {
 namespace corewm {
 
 // A set of basic focus and activation rules. Specializations should most likely
 // subclass this and call up to these methods rather than reimplementing them.
 class VIEWS_EXPORT BaseFocusRules : public FocusRules {
- public:
+ protected:
   BaseFocusRules();
   virtual ~BaseFocusRules();
 
- protected:
+  // Returns true if the children of |window| can be activated.
+  virtual bool SupportsChildActivation(aura::Window* window) = 0;
+
+  // Returns true if |window| is considered visible for activation purposes.
+  virtual bool IsWindowConsideredVisibleForActivation(aura::Window* window);
+
   // Overridden from FocusRules:
   virtual bool CanActivateWindow(aura::Window* window) OVERRIDE;
   virtual bool CanFocusWindow(aura::Window* window) OVERRIDE;
   virtual aura::Window* GetActivatableWindow(aura::Window* window) OVERRIDE;
   virtual aura::Window* GetFocusableWindow(aura::Window* window) OVERRIDE;
   virtual aura::Window* GetNextActivatableWindow(aura::Window* ignore) OVERRIDE;
   virtual aura::Window* GetNextFocusableWindow(aura::Window* ignore) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BaseFocusRules);
 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_BASE_FOCUS_RULES_H_