Add private PPAPI interfaces for PDFium accessibility.

pdf/out_of_process_instance.cc

Index: pdf/out_of_process_instance.cc
diff --git a/pdf/out_of_process_instance.cc b/pdf/out_of_process_instance.cc
index 869fdf24958af20bbff24f64720e0cae4f5bd3f5..cb57e10e786b49c9e8d531984197857f4b56d8f6 100644
--- a/pdf/out_of_process_instance.cc
+++ b/pdf/out_of_process_instance.cc
@@ -206,10 +206,20 @@ PP_Bool GetPrintPresetOptionsFromDocument(
   return PP_TRUE;
 }
 
+void EnableAccessibility(PP_Instance instance) {
+  void* object = pp::Instance::GetPerInstanceObject(instance, kPPPPdfInterface);
+  if (object) {
+    OutOfProcessInstance* obj_instance =
+        static_cast<OutOfProcessInstance*>(object);
+    return obj_instance->EnableAccessibility();
+  }
+}
+
 const PPP_Pdf ppp_private = {
   &GetLinkAtPosition,
   &Transform,
-  &GetPrintPresetOptionsFromDocument
+  &GetPrintPresetOptionsFromDocument,
+  &EnableAccessibility,
 };
 
 int ExtractPrintPreviewPageIndex(const std::string& src_url) {
@@ -614,6 +624,10 @@ void OutOfProcessInstance::GetPrintPresetOptionsFromDocument(
   options->uniform_page_size = uniform_page_size;
 }
 
+void OutOfProcessInstance::EnableAccessibility() {
+  engine_->EnableAccessibility();
+}
+
 pp::Var OutOfProcessInstance::GetLinkAtPosition(
     const pp::Point& point) {
   pp::Point offset_point(point);
@@ -1394,6 +1408,10 @@ void OutOfProcessInstance::IsSelectingChanged(bool is_selecting) {
   PostMessage(message);
 }
 
+int OutOfProcessInstance::GetToolbarHeight() {
+  return top_toolbar_height_ * device_scale_;
+}
+
 void OutOfProcessInstance::ProcessPreviewPageInfo(const std::string& url,
                                                   int dst_page_index) {
   if (!IsPrintPreview())