Fix accessible touch exploration inside of iframes.

content/browser/accessibility/browser_accessibility_manager.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 "content/browser/accessibility/browser_accessibility_manager.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 393 matching lines @@
   find_in_page_info_.match_index = match_index;
   find_in_page_info_.start_id = start_id;
   find_in_page_info_.start_offset = start_offset;
   find_in_page_info_.end_id = end_id;
   find_in_page_info_.end_offset = end_offset;
 
   if (find_in_page_info_.active_request_id == request_id)
     ActivateFindInPageResult(request_id);
 }
 
+void BrowserAccessibilityManager::OnChildFrameHitTestResult(
+    const gfx::Point& point,
+    int hit_obj_id) {
+  BrowserAccessibility* obj = GetFromID(hit_obj_id);
+  if (!obj || !obj->HasIntAttribute(ui::AX_ATTR_CHILD_TREE_ID))
+    return;
+
+  BrowserAccessibilityManager* child_manager =
+      BrowserAccessibilityManager::FromID(
+          obj->GetIntAttribute(ui::AX_ATTR_CHILD_TREE_ID));
+  if (!child_manager || !child_manager->delegate())
+    return;
+
+  return child_manager->delegate()->AccessibilityHitTest(point);
+}
+
 void BrowserAccessibilityManager::ActivateFindInPageResult(
     int request_id) {
   find_in_page_info_.active_request_id = request_id;
   if (find_in_page_info_.request_id != request_id)
     return;
 
   BrowserAccessibility* node = GetFromID(find_in_page_info_.start_id);
   if (!node)
     return;
 
@@ skipping 410 matching lines @@
       tree_->CreateTreeSource());
   ui::AXTreeSerializer<const ui::AXNode*,
                        ui::AXNodeData,
                        ui::AXTreeData> serializer(tree_source.get());
   ui::AXTreeUpdate update;
   serializer.SerializeChanges(tree_->root(), &update);
   return update;
 }
 
 }  // namespace content