Add a callback function: PDFiumEngine::Form_PageEvent

pdf/pdfium/pdfium_engine.cc

Index: pdf/pdfium/pdfium_engine.cc
diff --git a/pdf/pdfium/pdfium_engine.cc b/pdf/pdfium/pdfium_engine.cc
index 10f11d126bab753e53a370d020b9b6767b8e47c5..afd13473d085eb1defd8035d1055602df8eba891 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -583,6 +583,7 @@ PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
   FPDF_FORMFILLINFO::FFI_GetCurrentPageIndex = Form_GetCurrentPageIndex;
   FPDF_FORMFILLINFO::FFI_GetPageViewRect = Form_GetPageViewRect;
   FPDF_FORMFILLINFO::FFI_GetPlatform = Form_GetPlatform;
+  FPDF_FORMFILLINFO::FFI_PageEvent = Form_PageEvent;
   FPDF_FORMFILLINFO::FFI_PopupMenu = Form_PopupMenu;
   FPDF_FORMFILLINFO::FFI_PostRequestURL = Form_PostRequestURL;
   FPDF_FORMFILLINFO::FFI_PutRequestURL = Form_PutRequestURL;
@@ -794,6 +795,10 @@ int PDFiumEngine::Form_GetPlatform(FPDF_FORMFILLINFO* param,
   return platform_flag;
 }
 
+void PDFiumEngine::Form_PageEvent(FPDF_FORMFILLINFO* param,
+                                  int iPageIndex,
+                                  int iEventType) {}
+
 FPDF_BOOL PDFiumEngine::Form_PopupMenu(FPDF_FORMFILLINFO* param,
                                        FPDF_PAGE page,
                                        FPDF_WIDGET widget,