Split fwl/core class pt I.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index be9ced7ceea52a0869e8c4885b63f5c61e8c7d61..53d27d89e58d128649ffbe0bceb7b0eb7ce40c61 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1241,6 +1241,8 @@ if (pdf_enable_xfa) {
       "xfa/fwl/core/cfwl_picturebox.h",
       "xfa/fwl/core/cfwl_pushbutton.cpp",
       "xfa/fwl/core/cfwl_pushbutton.h",
+      "xfa/fwl/core/cfwl_sysbtn.cpp",
+      "xfa/fwl/core/cfwl_sysbtn.h",
       "xfa/fwl/core/cfwl_themebackground.h",
       "xfa/fwl/core/cfwl_themepart.h",
       "xfa/fwl/core/cfwl_themetext.h",
@@ -1273,7 +1275,6 @@ if (pdf_enable_xfa) {
       "xfa/fwl/core/ifwl_comboedit.h",
       "xfa/fwl/core/ifwl_combolist.cpp",
       "xfa/fwl/core/ifwl_combolist.h",
-      "xfa/fwl/core/ifwl_dataprovider.h",
       "xfa/fwl/core/ifwl_datetimeedit.cpp",
       "xfa/fwl/core/ifwl_datetimeedit.h",
       "xfa/fwl/core/ifwl_datetimepicker.cpp",
@@ -1299,6 +1300,8 @@ if (pdf_enable_xfa) {
       "xfa/fwl/core/ifwl_themeprovider.h",
       "xfa/fwl/core/ifwl_timer.cpp",
       "xfa/fwl/core/ifwl_timer.h",
+      "xfa/fwl/core/ifwl_timerinfo.cpp",
+      "xfa/fwl/core/ifwl_timerinfo.h",
       "xfa/fwl/core/ifwl_tooltip.cpp",
       "xfa/fwl/core/ifwl_tooltip.h",
       "xfa/fwl/core/ifwl_widget.cpp",