Enable DumpAccessibilityTree tests to use cross-process iframes.

content/browser/accessibility/accessibility_tree_formatter_blink.cc

 // Copyright (c) 2015 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 <stddef.h>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "content/browser/accessibility/accessibility_tree_formatter_blink.h"
 
 namespace content {
 
 AccessibilityTreeFormatterBlink::AccessibilityTreeFormatterBlink()
     : AccessibilityTreeFormatter() {
 }
 
 AccessibilityTreeFormatterBlink::~AccessibilityTreeFormatterBlink() {
 }
 
 uint32_t AccessibilityTreeFormatterBlink::ChildCount(
     const BrowserAccessibility& node) const {
-  return node.InternalChildCount();
+  if (node.HasIntAttribute(ui::AX_ATTR_CHILD_TREE_ID))
+    return node.PlatformChildCount();
+  else
+    return node.InternalChildCount();
 }
 
 BrowserAccessibility* AccessibilityTreeFormatterBlink::GetChild(
     const BrowserAccessibility& node,
     uint32_t i) const {
-  return node.InternalGetChild(i);
+  if (node.HasIntAttribute(ui::AX_ATTR_CHILD_TREE_ID))
+    return node.PlatformGetChild(i);
+  else
+    return node.InternalGetChild(i);
 }
 
 void AccessibilityTreeFormatterBlink::AddProperties(
     const BrowserAccessibility& node,
     base::DictionaryValue* dict) {
   dict->SetInteger("id", node.GetId());
 
   dict->SetString("role", ui::ToString(node.GetData().role));
 
   dict->SetInteger("boundsX", node.GetData().location.x());
@@ skipping 165 matching lines @@
 
 const std::string AccessibilityTreeFormatterBlink::GetAllowString() {
   return "@BLINK-ALLOW:";
 }
 
 const std::string AccessibilityTreeFormatterBlink::GetDenyString() {
   return "@BLINK-DENY:";
 }
 
 }  // namespace content