Move xfa/src up to xfa/.

This CL moves the xfa/src files up to the xfa/ directory and fixes the includes,
include guards, and build files.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1803723002 .
diff --git a/xfa/fxfa/app/xfa_ffpageview.h b/xfa/fxfa/app/xfa_ffpageview.h
new file mode 100644
index 0000000..b68e828
--- /dev/null
+++ b/xfa/fxfa/app/xfa_ffpageview.h
@@ -0,0 +1,111 @@
+// Copyright 2014 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_APP_XFA_FFPAGEVIEW_H_
+#define XFA_FXFA_APP_XFA_FFPAGEVIEW_H_
+
+#include "xfa/fxfa/parser/xfa_doclayout.h"
+
+class CXFA_FFWidget;
+class CXFA_FFDocView;
+class CXFA_FFPageView : public CXFA_ContainerLayoutItem, public IXFA_PageView {
+ public:
+  CXFA_FFPageView(CXFA_FFDocView* pDocView, CXFA_Node* pPageArea);
+  ~CXFA_FFPageView() override;
+
+  // IFXA_PageView:
+  IXFA_DocView* GetDocView() override;
+  int32_t GetPageViewIndex() override;
+  void GetPageViewRect(CFX_RectF& rtPage) override;
+  void GetDisplayMatrix(CFX_Matrix& mt,
+                        const CFX_Rect& rtDisp,
+                        int32_t iRotate) override;
+  int32_t LoadPageView(IFX_Pause* pPause = NULL) override;
+  void UnloadPageView() override;
+  IXFA_Widget* GetWidgetByPos(FX_FLOAT fx, FX_FLOAT fy) override;
+  IXFA_WidgetIterator* CreateWidgetIterator(
+      FX_DWORD dwTraverseWay = XFA_TRAVERSEWAY_Form,
+      FX_DWORD dwWidgetFilter = XFA_WIDGETFILTER_Visible |
+                                XFA_WIDGETFILTER_Viewable |
+                                XFA_WIDGETFILTER_AllType) override;
+
+  FX_BOOL IsPageViewLoaded();
+
+ protected:
+  CXFA_FFDocView* m_pDocView;
+  FX_BOOL m_bLoaded;
+};
+typedef CXFA_NodeIteratorTemplate<CXFA_LayoutItem,
+                                  CXFA_TraverseStrategy_LayoutItem>
+    CXFA_LayoutItemIterator;
+class CXFA_FFPageWidgetIterator : public IXFA_WidgetIterator {
+ public:
+  CXFA_FFPageWidgetIterator(CXFA_FFPageView* pPageView, FX_DWORD dwFilter);
+  virtual ~CXFA_FFPageWidgetIterator();
+  virtual void Release() { delete this; }
+
+  virtual void Reset();
+  virtual IXFA_Widget* MoveToFirst();
+  virtual IXFA_Widget* MoveToLast();
+  virtual IXFA_Widget* MoveToNext();
+  virtual IXFA_Widget* MoveToPrevious();
+  virtual IXFA_Widget* GetCurrentWidget();
+  virtual FX_BOOL SetCurrentWidget(IXFA_Widget* hWidget);
+
+ protected:
+  IXFA_Widget* GetWidget(CXFA_LayoutItem* pLayoutItem);
+  CXFA_FFPageView* m_pPageView;
+  IXFA_Widget* m_hCurWidget;
+  FX_DWORD m_dwFilter;
+  FX_BOOL m_bIgnorerelevant;
+  CXFA_LayoutItemIterator m_sIterator;
+};
+typedef CFX_ArrayTemplate<CXFA_FFWidget*> CXFA_WidgetArray;
+class CXFA_TabParam {
+ public:
+  CXFA_TabParam() : m_pWidget(NULL) {}
+  ~CXFA_TabParam() {}
+
+  CXFA_FFWidget* m_pWidget;
+  CXFA_WidgetArray m_Children;
+};
+class CXFA_FFTabOrderPageWidgetIterator : public IXFA_WidgetIterator {
+ public:
+  CXFA_FFTabOrderPageWidgetIterator(CXFA_FFPageView* pPageView,
+                                    FX_DWORD dwFilter);
+  virtual ~CXFA_FFTabOrderPageWidgetIterator();
+
+  virtual void Release();
+
+  virtual void Reset();
+  virtual IXFA_Widget* MoveToFirst();
+  virtual IXFA_Widget* MoveToLast();
+  virtual IXFA_Widget* MoveToNext();
+  virtual IXFA_Widget* MoveToPrevious();
+  virtual IXFA_Widget* GetCurrentWidget();
+  virtual FX_BOOL SetCurrentWidget(IXFA_Widget* hWidget);
+
+ protected:
+  CXFA_WidgetArray m_TabOrderWidgetArray;
+  CXFA_FFPageView* m_pPageView;
+  FX_DWORD m_dwFilter;
+  int32_t m_iCurWidget;
+  FX_BOOL m_bIgnorerelevant;
+  CXFA_FFWidget* GetTraverseWidget(CXFA_FFWidget* pWidget);
+  CXFA_FFWidget* FindWidgetByName(const CFX_WideStringC& wsWidgetName,
+                                  CXFA_FFWidget* pRefWidget);
+  void CreateTabOrderWidgetArray();
+  void CreateSpaceOrderWidgetArray(CXFA_WidgetArray& WidgetArray);
+  CXFA_FFWidget* GetWidget(CXFA_LayoutItem* pLayoutItem);
+  void OrderContainer(CXFA_LayoutItemIterator* sIterator,
+                      CXFA_LayoutItem* pContainerItem,
+                      CXFA_TabParam* pContainer,
+                      FX_BOOL& bCurrentItem,
+                      FX_BOOL& bContentArea,
+                      FX_BOOL bMarsterPage = FALSE);
+};
+
+#endif  // XFA_FXFA_APP_XFA_FFPAGEVIEW_H_