Keep track of accessibility focus across windows.

content/browser/accessibility/browser_accessibility_manager_mac.mm

 // 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 "content/browser/accessibility/browser_accessibility_manager_mac.h"
 
 #include <stddef.h>
 
 #import "base/mac/mac_util.h"
 #import "base/mac/sdk_forward_declarations.h"
@@ skipping 88 matching lines @@
   ui::AXNodeData empty_document;
   empty_document.id = 0;
   empty_document.role = ui::AX_ROLE_ROOT_WEB_AREA;
   empty_document.state =
       1 << ui::AX_STATE_READ_ONLY;
   ui::AXTreeUpdate update;
   update.nodes.push_back(empty_document);
   return update;
 }
 
-BrowserAccessibility* BrowserAccessibilityManagerMac::GetFocus(
-    BrowserAccessibility* root) {
+BrowserAccessibility* BrowserAccessibilityManagerMac::GetFocus() {
   // On Mac, list boxes should always get focus on the whole list, otherwise
   // information about the number of selected items will never be reported.
-  BrowserAccessibility* node = BrowserAccessibilityManager::GetFocus(root);
+  BrowserAccessibility* node = BrowserAccessibilityManager::GetFocus();
   if (node && node->GetRole() == ui::AX_ROLE_LIST_BOX)
     return node;
 
   // For other roles, follow the active descendant.
-  return GetActiveDescendantFocus(root);
+  return GetActiveDescendantFocus(node);
 }
 
 void BrowserAccessibilityManagerMac::NotifyAccessibilityEvent(
     ui::AXEvent event_type,
     BrowserAccessibility* node) {
   if (!node->IsNative())
     return;
 
   if (event_type == ui::AX_EVENT_FOCUS) {
-    BrowserAccessibility* active_descendant = GetActiveDescendantFocus(
-        GetRoot());
+    BrowserAccessibility* active_descendant = GetActiveDescendantFocus(node);
     if (active_descendant)
       node = active_descendant;
 
     if (node->GetRole() == ui::AX_ROLE_LIST_BOX_OPTION &&
         node->HasState(ui::AX_STATE_SELECTED) &&
         node->GetParent() &&
         node->GetParent()->GetRole() == ui::AX_ROLE_LIST_BOX) {
       node = node->GetParent();
-      SetFocus(node, false);
+      SetFocus(*node);
     }
   }
 
   auto native_node = node->ToBrowserAccessibilityCocoa();
   DCHECK(native_node);
 
   // Refer to |AXObjectCache::postPlatformNotification| in WebKit source code.
   NSString* mac_notification;
   switch (event_type) {
     case ui::AX_EVENT_ACTIVEDESCENDANTCHANGED:
@@ skipping 158 matching lines @@
     auto native_focus_object = focus_object->ToBrowserAccessibilityCocoa();
     if (native_focus_object)
       [user_info setObject:native_focus_object
                     forKey:NSAccessibilityTextChangeElement];
   }
 
   return user_info;
 }
 
 }  // namespace content