Make code compile with clang_use_chrome_plugin (part VI)

xfa/fwl/lightwidget/cfwl_widgetproperties.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fwl/lightwidget/cfwl_widgetproperties.h"
 
 #include "xfa/fwl/lightwidget/cfwl_widget.h"
 
+CFWL_WidgetProperties::CFWL_WidgetProperties()
+    : m_dwStyles(FWL_WGTSTYLE_Child),
+      m_dwStyleExes(0),
+      m_dwStates(0),
+      m_pParent(nullptr),
+      m_pOwner(nullptr) {
+  m_rtWidget.Set(0, 0, 0, 0);
+}
+
+CFWL_WidgetProperties::~CFWL_WidgetProperties() {}
+
+CFWL_WidgetProperties::CFWL_WidgetProperties(
+    const CFWL_WidgetProperties& other) = default;
+
 CFWL_WidgetImpProperties CFWL_WidgetProperties::MakeWidgetImpProperties(
     IFWL_DataProvider* pDataProvider) const {
   CFWL_WidgetImpProperties result;
   result.m_ctmOnParent = m_ctmOnParent;
   result.m_rtWidget = m_rtWidget;
   result.m_dwStyles = m_dwStyles;
   result.m_dwStyleExes = m_dwStyleExes;
   result.m_dwStates = m_dwStates;
   if (m_pParent)
     result.m_pParent = m_pParent->GetWidget();
   if (m_pOwner)
     result.m_pOwner = m_pOwner->GetWidget();
   result.m_pDataProvider = pDataProvider;
   return result;
 }