Add private PPAPI interfaces for PDFium accessibility.

ppapi/proxy/pdf_resource.h

 // Copyright (c) 2013 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 PPAPI_PROXY_PDF_RESOURCE_H_
 #define PPAPI_PROXY_PDF_RESOURCE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ppapi/c/pp_instance.h"
@@ skipping 36 matching lines @@
   void HasUnsupportedFeature() override;
   void Print() override;
   void SaveAs() override;
   PP_Bool IsFeatureEnabled(PP_PDFFeature feature) override;
   void SetSelectedText(const char* selected_text) override;
   void SetLinkUnderCursor(const char* url) override;
   void GetV8ExternalSnapshotData(const char** natives_data_out,
                                  int* natives_size_out,
                                  const char** snapshot_data_out,
                                  int* snapshot_size_out) override;
+  void SetAccessibilityViewportInfo(
+      PP_PrivateAccessibilityViewportInfo* viewport_info) override;
+  void SetAccessibilityDocInfo(
+      PP_PrivateAccessibilityDocInfo* doc_info) override;
+  void SetAccessibilityPageInfo(
+      PP_PrivateAccessibilityPageInfo* page_info,
+      PP_PrivateAccessibilityTextRunInfo text_runs[],
+      PP_PrivateAccessibilityCharInfo chars[]) override;
 
  private:
   std::string locale_;
 
   DISALLOW_COPY_AND_ASSIGN(PDFResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PDF_RESOURCE_H_