Rename xfa_doclayout and xfa_document_layout_imp files.

xfa/fxfa/parser/cxfa_containerlayoutitem.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_FXFA_PARSER_CXFA_CONTAINERLAYOUTITEM_H_
+#define XFA_FXFA_PARSER_CXFA_CONTAINERLAYOUTITEM_H_
+
+#include "xfa/fxfa/parser/cxfa_layoutitem.h"
+
+class CXFA_ContainerLayoutItem : public CXFA_LayoutItem {
+ public:
+  CXFA_ContainerLayoutItem(CXFA_Node* pNode);
+
+  CXFA_LayoutProcessor* GetLayout() const;
+  int32_t GetPageIndex() const;
+  CFX_SizeF GetPageSize() const;
+  CXFA_Node* GetMasterPage() const;
+
+  CXFA_Node* m_pOldSubform;
+};
+
+inline CXFA_ContainerLayoutItem* ToContainerLayoutItem(CXFA_LayoutItem* pItem) {
+  return pItem ? pItem->AsContainerLayoutItem() : nullptr;
+}
+
+#endif  // XFA_FXFA_PARSER_CXFA_CONTAINERLAYOUTITEM_H_