Add pdf layer code for PDFium XFA module

pdf/pdfium/pdfium_engine.h

Index: pdf/pdfium/pdfium_engine.h
diff --git a/pdf/pdfium/pdfium_engine.h b/pdf/pdfium/pdfium_engine.h
index cb3d0f4030e8f0aa2cd497dfe4bb10f4559f4d57..38fafdd7fe9c1aa96afa31d49851226ef0092432 100644
--- a/pdf/pdfium/pdfium_engine.h
+++ b/pdf/pdfium/pdfium_engine.h
@@ -473,6 +473,70 @@ class PDFiumEngine : public PDFEngine,
   static void Form_GotoPage(IPDF_JSPLATFORM* param, int page_number);
   static int Form_Browse(IPDF_JSPLATFORM* param, void* file_path, int length);
 
+#ifdef PDF_USE_XFA
+  static void Form_EmailTo(FPDF_FORMFILLINFO* param,
+                           FPDF_FILEHANDLER* file_handler,
+                           FPDF_WIDESTRING to,
+                           FPDF_WIDESTRING subject,
+                           FPDF_WIDESTRING cc,
+                           FPDF_WIDESTRING bcc,
+                           FPDF_WIDESTRING message);
+  static void Form_DisplayCaret(FPDF_FORMFILLINFO* param,
+                                FPDF_PAGE page,
+                                FPDF_BOOL visible,
+                                double left,
+                                double top,
+                                double right,
+                                double bottom);
+  static void Form_SetCurrentPage(FPDF_FORMFILLINFO* param,
+                                  FPDF_DOCUMENT document,
+                                  int page);
+  static int Form_GetCurrentPageIndex(FPDF_FORMFILLINFO* param,
+                                      FPDF_DOCUMENT document);
+  static void Form_GetPageViewRect(FPDF_FORMFILLINFO* param,
+                                   FPDF_PAGE page,
+                                   double* left,
+                                   double* top,
+                                   double* right,
+                                   double* bottom);
+  static int Form_GetPlatform(FPDF_FORMFILLINFO* param,
+                              void* platform,
+                              int length);
+  static FPDF_BOOL Form_PopupMenu(FPDF_FORMFILLINFO* param,
+                                  FPDF_PAGE page,
+                                  FPDF_WIDGET widget,
+                                  int menu_flag,
+                                  float x,
+                                  float y);
+  static FPDF_BOOL Form_PostRequestURL(FPDF_FORMFILLINFO* param,
+                                       FPDF_WIDESTRING url,
+                                       FPDF_WIDESTRING data,
+                                       FPDF_WIDESTRING content_type,
+                                       FPDF_WIDESTRING encode,
+                                       FPDF_WIDESTRING header,
+                                       FPDF_BSTR* response);
+  static FPDF_BOOL Form_PutRequestURL(FPDF_FORMFILLINFO* param,
+                                      FPDF_WIDESTRING url,
+                                      FPDF_WIDESTRING data,
+                                      FPDF_WIDESTRING encode);
+  static void Form_UploadTo(FPDF_FORMFILLINFO* param,
+                            FPDF_FILEHANDLER* file_handler,
+                            int file_flag,
+                            FPDF_WIDESTRING dest);
+  static FPDF_LPFILEHANDLER Form_DownloadFromURL(FPDF_FORMFILLINFO* param,
+                                                 FPDF_WIDESTRING url);
+  static FPDF_FILEHANDLER* Form_OpenFile(FPDF_FORMFILLINFO* param,
+                                         int file_flag,
+                                         FPDF_WIDESTRING url,
+                                         const char* mode);
+  static void Form_GotoURL(FPDF_FORMFILLINFO* param,
+                           FPDF_DOCUMENT document,
+                           FPDF_WIDESTRING url);
+  static int Form_GetLanguage(FPDF_FORMFILLINFO* param,
+                              void* language,
+                              int length);
+#endif  // PDF_USE_XFA
+
   // IFSDK_PAUSE callbacks
   static FPDF_BOOL Pause_NeedToPauseNow(IFSDK_PAUSE* param);