Initialize V8 in PDFium from external files (plugin process only)

ppapi/proxy/pdf_resource.h

Index: ppapi/proxy/pdf_resource.h
diff --git a/ppapi/proxy/pdf_resource.h b/ppapi/proxy/pdf_resource.h
index c15d73808f94b522bc576449be4191cfa579b13f..9ca82c63e4cb778d5989789bca7fb99a544bd657 100644
--- a/ppapi/proxy/pdf_resource.h
+++ b/ppapi/proxy/pdf_resource.h
@@ -57,6 +57,10 @@ class PPAPI_PROXY_EXPORT PDFResource
   virtual PP_Bool IsOutOfProcess() override;
   virtual void SetSelectedText(const char* selected_text) override;
   virtual void SetLinkUnderCursor(const char* url) override;
+  virtual void GetV8ExternalSnapshotData(const char** natives_data_out,
+                                         int* natives_size_out,
+                                         const char** snapshot_data_out,
+                                         int* snapshot_size_out) override;
 
  private:
   std::string locale_;