Add private PPAPI interfaces for PDFium accessibility.

ppapi/thunk/ppb_pdf_thunk.cc

Index: ppapi/thunk/ppb_pdf_thunk.cc
diff --git a/ppapi/thunk/ppb_pdf_thunk.cc b/ppapi/thunk/ppb_pdf_thunk.cc
index 4966bd4dd6947c90ec346a94418a0b36810a2747..c3f6099b09c0b7c52a6f07b8d868465371f48090 100644
--- a/ppapi/thunk/ppb_pdf_thunk.cc
+++ b/ppapi/thunk/ppb_pdf_thunk.cc
@@ -131,6 +131,47 @@ void GetV8ExternalSnapshotData(PP_Instance instance,
       natives_size_out, snapshot_data_out, snapshot_size_out);
 }
 
+void SetAccessibilityViewportInfo(
+    PP_Instance instance,
+    PP_PrivateAccessibilityViewportInfo* viewport_info) {
+  EnterInstanceAPI<PPB_PDF_API> enter(instance);
+  if (enter.failed())
+    return;
+  enter.functions()->SetAccessibilityViewportInfo(viewport_info);
+}
+
+void SetAccessibilityDocInfo(
+    PP_Instance instance,
+    PP_PrivateAccessibilityDocInfo* doc_info) {
+  EnterInstanceAPI<PPB_PDF_API> enter(instance);
+  if (enter.failed())
+    return;
+  enter.functions()->SetAccessibilityDocInfo(doc_info);
+}
+
+void SetAccessibilityPageInfo(
+    PP_Instance instance,
+    uint32_t page_index,
+    PP_PrivateAccessibilityPageInfo* page_info) {
+  EnterInstanceAPI<PPB_PDF_API> enter(instance);
+  if (enter.failed())
+    return;
+  enter.functions()->SetAccessibilityPageInfo(page_index, page_info);
+}
+
+void SetAccessibilityTextRunInfo(
+    PP_Instance instance,
+    uint32_t page_index,
+    uint32_t text_run_index,
+    PP_PrivateAccessibilityTextRunInfo* text_run_info,
+    PP_PrivateAccessibilityCharInfo chars[]) {
+  EnterInstanceAPI<PPB_PDF_API> enter(instance);
+  if (enter.failed())
+    return;
+  enter.functions()->SetAccessibilityTextRunInfo(
+      page_index, text_run_index, text_run_info, chars);
+}
+
 const PPB_PDF g_ppb_pdf_thunk = {
   &GetFontFileWithFallback,
   &GetFontTableForPrivateFontFile,
@@ -146,6 +187,10 @@ const PPB_PDF g_ppb_pdf_thunk = {
   &SetSelectedText,
   &SetLinkUnderCursor,
   &GetV8ExternalSnapshotData,
+  &SetAccessibilityViewportInfo,
+  &SetAccessibilityDocInfo,
+  &SetAccessibilityPageInfo,
+  &SetAccessibilityTextRunInfo
 };
 
 }  // namespace