Add private PPAPI interfaces for PDFium accessibility.

ppapi/cpp/private/pdf.cc

Index: ppapi/cpp/private/pdf.cc
diff --git a/ppapi/cpp/private/pdf.cc b/ppapi/cpp/private/pdf.cc
index 350d87005442693fc840fdcbae9443d903a333b9..8bd3aebea941f7afe1d94a69b6d1c5fe5de7d5db 100644
--- a/ppapi/cpp/private/pdf.cc
+++ b/ppapi/cpp/private/pdf.cc
@@ -152,4 +152,41 @@ void PDF::GetV8ExternalSnapshotData(const InstanceHandle& instance,
   *snapshot_size_out = 0;
 }
 
+// static
+void PDF::SetAccessibilityViewportInfo(
+    const InstanceHandle& instance,
+    PP_PrivateAccessibilityViewportInfo* viewport_info) {
+  if (has_interface<PPB_PDF>()) {
+    get_interface<PPB_PDF>()->SetAccessibilityViewportInfo(
+        instance.pp_instance(),
+        viewport_info);
+  }
+}
+
+// static
+void PDF::SetAccessibilityDocInfo(
+    const InstanceHandle& instance,
+    PP_PrivateAccessibilityDocInfo* doc_info) {
+  if (has_interface<PPB_PDF>()) {
+    get_interface<PPB_PDF>()->SetAccessibilityDocInfo(
+        instance.pp_instance(),
+        doc_info);
+  }
+}
+
+// static
+void PDF::SetAccessibilityPageInfo(
+    const InstanceHandle& instance,
+    PP_PrivateAccessibilityPageInfo* page_info,
+    PP_PrivateAccessibilityTextRunInfo text_runs[],
+    PP_PrivateAccessibilityCharInfo chars[]) {
+  if (has_interface<PPB_PDF>()) {
+    get_interface<PPB_PDF>()->SetAccessibilityPageInfo(
+        instance.pp_instance(),
+        page_info,
+        text_runs,
+        chars);
+  }
+}
+
 }  // namespace pp