Add private PPAPI interfaces for PDFium accessibility.

ppapi/thunk/ppb_pdf_api.h

 // Copyright (c) 2011 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_THUNK_PPB_PDF_API_H_
 #define PPAPI_THUNK_PPB_PDF_API_H_
 
 #include "ppapi/c/private/ppb_pdf.h"
 #include "ppapi/shared_impl/singleton_resource_id.h"
 
@@ skipping 14 matching lines @@
   virtual void HasUnsupportedFeature() = 0;
   virtual void SaveAs() = 0;
   virtual PP_Bool IsFeatureEnabled(PP_PDFFeature feature) = 0;
   virtual void Print() = 0;
   virtual void SetSelectedText(const char* selected_text) = 0;
   virtual void SetLinkUnderCursor(const char* url) = 0;
   virtual void GetV8ExternalSnapshotData(const char** natives_data_out,
                                          int* natives_size_out,
                                          const char** snapshot_data_out,
                                          int* snapshot_size_out) = 0;
-
+  virtual void SetAccessibilityViewportInfo(
+      PP_PrivateAccessibilityViewportInfo* viewport_info) = 0;
+  virtual void SetAccessibilityDocInfo(
+      PP_PrivateAccessibilityDocInfo* doc_info) = 0;
+  virtual void SetAccessibilityPageInfo(
+      PP_PrivateAccessibilityPageInfo* page_info,
+      PP_PrivateAccessibilityTextRunInfo text_runs[],
+      PP_PrivateAccessibilityCharInfo chars[]) = 0;
   static const SingletonResourceID kSingletonResourceID = PDF_SINGLETON_ID;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_PPB_PDF_API_H_