Add private PPAPI interfaces for PDFium accessibility.

components/pdf/renderer/pepper_pdf_host.h

Index: components/pdf/renderer/pepper_pdf_host.h
diff --git a/components/pdf/renderer/pepper_pdf_host.h b/components/pdf/renderer/pepper_pdf_host.h
index 7787229a6fc139de5aa3a5998161fa7ff7fd852e..2c7eb3306cafb210712747b8d74a41d2f771c6d7 100644
--- a/components/pdf/renderer/pepper_pdf_host.h
+++ b/components/pdf/renderer/pepper_pdf_host.h
@@ -89,6 +89,17 @@ class PepperPDFHost : public ppapi::host::ResourceHost {
                                    const base::string16& selected_text);
   int32_t OnHostMsgSetLinkUnderCursor(ppapi::host::HostMessageContext* context,
                                       const std::string& url);
+  int32_t OnHostMsgSetAccessibilityViewportInfo(
+      ppapi::host::HostMessageContext* context,
+      const PP_PrivateAccessibilityViewportInfo& viewport_info);
+  int32_t OnHostMsgSetAccessibilityDocInfo(
+      ppapi::host::HostMessageContext* context,
+      const PP_PrivateAccessibilityDocInfo& doc_info);
+  int32_t OnHostMsgSetAccessibilityPageInfo(
+      ppapi::host::HostMessageContext* context,
+      const PP_PrivateAccessibilityPageInfo& page_info,
+      const std::vector<PP_PrivateAccessibilityTextRunInfo>& text_runs,
+      const std::vector<PP_PrivateAccessibilityCharInfo>& chars);
 
   content::RendererPpapiHost* host_;