Add private PPAPI interfaces for PDFium accessibility.

components/pdf/renderer/pepper_pdf_host.cc

Index: components/pdf/renderer/pepper_pdf_host.cc
diff --git a/components/pdf/renderer/pepper_pdf_host.cc b/components/pdf/renderer/pepper_pdf_host.cc
index ce0eddba0a51df1a5ce3d22f5df153679cbf3509..29d3de143c54fa521eee62d7d84bba3fa3d2f21e 100644
--- a/components/pdf/renderer/pepper_pdf_host.cc
+++ b/components/pdf/renderer/pepper_pdf_host.cc
@@ -79,6 +79,15 @@ int32_t PepperPDFHost::OnResourceMessageReceived(
                                       OnHostMsgSetLinkUnderCursor)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_PDF_SetContentRestriction,
                                       OnHostMsgSetContentRestriction)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_PDF_SetAccessibilityViewportInfo,
+        OnHostMsgSetAccessibilityViewportInfo)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_PDF_SetAccessibilityDocInfo,
+        OnHostMsgSetAccessibilityDocInfo)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_PDF_SetAccessibilityPageInfo,
+        OnHostMsgSetAccessibilityPageInfo)
   PPAPI_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
@@ -183,4 +192,24 @@ int32_t PepperPDFHost::OnHostMsgSetLinkUnderCursor(
   return PP_OK;
 }
 
+int32_t PepperPDFHost::OnHostMsgSetAccessibilityViewportInfo(
+    ppapi::host::HostMessageContext* context,
+    const PP_PrivateAccessibilityViewportInfo& viewport_info) {
+  return PP_OK;
+}
+
+int32_t PepperPDFHost::OnHostMsgSetAccessibilityDocInfo(
+    ppapi::host::HostMessageContext* context,
+    const PP_PrivateAccessibilityDocInfo& doc_info) {
+  return PP_OK;
+}
+
+int32_t PepperPDFHost::OnHostMsgSetAccessibilityPageInfo(
+    ppapi::host::HostMessageContext* context,
+    const PP_PrivateAccessibilityPageInfo& page_info,
+    const std::vector<PP_PrivateAccessibilityTextRunInfo>& text_run_info,
+    const std::vector<PP_PrivateAccessibilityCharInfo>& chars) {
+  return PP_OK;
+}
+
 }  // namespace pdf