Update PDF accessibility when zoom level changes

content/renderer/accessibility/render_accessibility_impl.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_RENDERER_ACCESSIBILITY_RENDER_ACCESSIBILITY_IMPL_H_
 #define CONTENT_RENDERER_ACCESSIBILITY_RENDER_ACCESSIBILITY_IMPL_H_
 
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 49 matching lines @@
   static void SnapshotAccessibilityTree(
       RenderFrameImpl* render_frame,
       AXContentTreeUpdate* response);
 
   explicit RenderAccessibilityImpl(RenderFrameImpl* render_frame);
   ~RenderAccessibilityImpl() override;
 
   // RenderAccessibility implementation.
   int GenerateAXID() override;
   void SetPdfTreeSource(PdfAXTreeSource* source) override;
+  void OnPdfRootNodeUpdated() override;
 
   // RenderFrameObserver implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // Called when an accessibility notification occurs in Blink.
   void HandleWebAccessibilityEvent(const blink::WebAXObject& obj,
                                    blink::WebAXEvent event);
 
   // Called when a new find in page result is highlighted.
   void HandleAccessibilityFindInPageResult(
@@ skipping 96 matching lines @@
 
   // So we can queue up tasks to be executed later.
   base::WeakPtrFactory<RenderAccessibilityImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderAccessibilityImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ACCESSIBILITY_RENDERER_ACCESSIBILITY_H_