Fix accessible touch exploration inside of iframes.

content/browser/accessibility/browser_accessibility_manager.cc

Index: content/browser/accessibility/browser_accessibility_manager.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager.cc b/content/browser/accessibility/browser_accessibility_manager.cc
index db169daf95bcf419160c1d3682024c7c3c7db71f..f7714fa592bf8101aa177b726c41218bb37f05e0 100644
--- a/content/browser/accessibility/browser_accessibility_manager.cc
+++ b/content/browser/accessibility/browser_accessibility_manager.cc
@@ -411,6 +411,22 @@ void BrowserAccessibilityManager::OnFindInPageResult(
     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;