Move xfa/include/fwl/{core,basewidget} to xfa/fwl/{core,basewidget}.

xfa/fwl/core/ifwl_widgetdelegate.h

+// 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
+
+#ifndef XFA_FWL_CORE_IFWL_WIDGETDELEGATE_H_
+#define XFA_FWL_CORE_IFWL_WIDGETDELEGATE_H_
+
+#include "xfa/fwl/core/fwl_error.h"
+
+class CFWL_Event;
+class CFWL_Message;
+class CFX_Graphics;
+class CFX_Matrix;
+
+class IFWL_WidgetDelegate {
+ public:
+  virtual ~IFWL_WidgetDelegate() {}
+  virtual int32_t OnProcessMessage(CFWL_Message* pMessage) = 0;
+  virtual FWL_ERR OnProcessEvent(CFWL_Event* pEvent) = 0;
+  virtual FWL_ERR OnDrawWidget(CFX_Graphics* pGraphics,
+                               const CFX_Matrix* pMatrix = NULL) = 0;
+};
+
+#endif  // XFA_FWL_CORE_IFWL_WIDGETDELEGATE_H_