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, 19 insertions, 0 deletions

diff --git a/xfa/fwl/core/cfwl_widgetmgr.cpp b/xfa/fwl/core/cfwl_widgetmgr.cpp
index 78d8206369..d36ab7792b 100644
--- a/xfa/fwl/core/cfwl_widgetmgr.cpp
+++ b/xfa/fwl/core/cfwl_widgetmgr.cpp
@@ -859,3 +859,22 @@ FX_BOOL CFWL_WidgetMgrDelegate::bUseOffscreenDirect(IFWL_Widget* pWidget) {
 
   return pItem->iRedrawCounter == 0;
 }
+
+CFWL_WidgetMgrItem::CFWL_WidgetMgrItem() : CFWL_WidgetMgrItem(nullptr) {}
+
+CFWL_WidgetMgrItem::CFWL_WidgetMgrItem(IFWL_Widget* widget)
+    : pParent(nullptr),
+      pOwner(nullptr),
+      pChild(nullptr),
+      pPrevious(nullptr),
+      pNext(nullptr),
+      pWidget(widget),
+      iRedrawCounter(0)
+#if (_FX_OS_ == _FX_WIN32_DESKTOP_) || (_FX_OS_ == _FX_WIN64_)
+      ,
+      bOutsideChanged(FALSE)
+#endif
+{
+}
+
+CFWL_WidgetMgrItem::~CFWL_WidgetMgrItem() {}