Make code compile with clang_use_chrome_plugin (part VI)

This change mainly contains files in xfa/fwl directory.
This is part of the efforts to make PDFium code compilable
by Clang chromium style plugins.

The changes are mainly the following:
-- move inline constructor/destructor of complex class/struct out-of-line;
-- add constructor/destructor of complex class/struct if not
 explicitly defined;
-- add explicit out-of-line copy constructor when needed;
-- move inline virtual functions out-of-line;
-- Properly mark virtual functions with 'override';
-- some minor cleanups;

BUG=pdfium:469

Review-Url: https://codereview.chromium.org/2070583003

1 files changed, 27 insertions, 0 deletions

diff --git a/xfa/fwl/basewidget/fwl_datetimepickerimp.cpp b/xfa/fwl/basewidget/fwl_datetimepickerimp.cpp
index 6df6fb364e..bf534a7a97 100644
--- a/xfa/fwl/basewidget/fwl_datetimepickerimp.cpp
+++ b/xfa/fwl/basewidget/fwl_datetimepickerimp.cpp
@@ -1181,3 +1181,30 @@ void CFWL_DateTimePickerImpDelegate::DisForm_OnFocusChanged(CFWL_Message* pMsg,
   rtInvalidate.Inflate(2, 2);
   m_pOwner->Repaint(&rtInvalidate);
 }
+
+CFWL_DateTimePickerImp::CFWL_MonthCalendarImpDP::CFWL_MonthCalendarImpDP() {
+  m_iCurYear = 2010;
+  m_iCurMonth = 3;
+  m_iCurDay = 29;
+}
+
+FWL_Error CFWL_DateTimePickerImp::CFWL_MonthCalendarImpDP::GetCaption(
+    IFWL_Widget* pWidget,
+    CFX_WideString& wsCaption) {
+  return FWL_Error::Succeeded;
+}
+
+int32_t CFWL_DateTimePickerImp::CFWL_MonthCalendarImpDP::GetCurDay(
+    IFWL_Widget* pWidget) {
+  return m_iCurDay;
+}
+
+int32_t CFWL_DateTimePickerImp::CFWL_MonthCalendarImpDP::GetCurMonth(
+    IFWL_Widget* pWidget) {
+  return m_iCurMonth;
+}
+
+int32_t CFWL_DateTimePickerImp::CFWL_MonthCalendarImpDP::GetCurYear(
+    IFWL_Widget* pWidget) {
+  return m_iCurYear;
+}