Enable DumpAccessibilityTree tests to use cross-process iframes.

content/browser/accessibility/browser_accessibility_manager.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 269 matching lines @@
       ui::AXTree* tree,
       bool root_changed,
       const std::vector<ui::AXTreeDelegate::Change>& changes) override;
 
   BrowserAccessibilityDelegate* delegate() const { return delegate_; }
   void set_delegate(BrowserAccessibilityDelegate* delegate) {
     delegate_ = delegate;
   }
 
   // If this BrowserAccessibilityManager is a child frame or guest frame,
-  // return the BrowserAccessibilityDelegate from the highest ancestor frame
+  // return the BrowserAccessibilityManager from the highest ancestor frame
   // in the frame tree.
+  BrowserAccessibilityManager* GetRootManager();
+
+  // Returns the BrowserAccessibilityDelegate from |GetRootManager|, above.
   BrowserAccessibilityDelegate* GetDelegateFromRootManager();
 
   // Get a snapshot of the current tree as an AXTreeUpdate.
   ui::AXTreeUpdate SnapshotAXTreeForTesting();
 
  protected:
   BrowserAccessibilityManager(
       BrowserAccessibilityDelegate* delegate,
       BrowserAccessibilityFactory* factory);
 
@@ skipping 56 matching lines @@
   // node within that parent tree. It's computed as needed and cached for
   // speed so that it can be accessed quickly if it hasn't changed.
   int parent_node_id_from_parent_tree_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_H_