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

ui/views/corewm/window_modality_controller.cc

 // 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.
 
 #include "ui/views/corewm/window_modality_controller.h"
 
 #include <algorithm>
 
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/capture_client.h"
@@ skipping 57 matching lines @@
   }
   return NULL;
 }
 
 }  // namespace
 
 void SetModalParent(aura::Window* child, aura::Window* parent) {
   child->SetProperty(kModalParentKey, parent);
 }
 
+aura::Window* GetModalTransientForActivatableWindow(
+    aura::Window* activatable) {
+  return GetModalTransientChild(activatable, activatable);
+}
+
 aura::Window* GetModalTransient(aura::Window* window) {
   if (!window)
     return NULL;
 
   // We always want to check the for the transient child of the activatable
   // window.
   aura::Window* activatable = GetActivatableWindow(window);
   if (!activatable)
     return NULL;
 
@@ skipping 61 matching lines @@
   aura::Window* modal_transient_child = GetModalTransient(target);
   if (modal_transient_child && (event->type() == ui::ET_MOUSE_PRESSED ||
                                 event->type() == ui::ET_TOUCH_PRESSED)) {
     AnimateWindow(modal_transient_child, WINDOW_ANIMATION_TYPE_BOUNCE);
   }
   return !!modal_transient_child;
 }
 
 }  // namespace corewm
 }  // namespace views