Fix IWYU in formfiller/ directory.

fpdfsdk/include/fsdk_baseannot.h

 // 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 _FSDK_BASEANNOT_H_
 #define _FSDK_BASEANNOT_H_
 
 #if _FX_OS_ == _FX_ANDROID_
 #include "time.h"
 #else
 #include <ctime>
 #endif
 
+#include "../../core/include/fpdfdoc/fpdf_doc.h"
+#include "../../core/include/fxcrt/fx_basic.h"
+#include "fx_systemhandler.h"
+
 class CPDFSDK_PageView;
+class CPDF_Annot;
+class CPDF_Page;
+class CPDF_Rect;
+class CPDF_Matrix;
+class CPDF_RenderOptions;
+class CFX_RenderDevice;
+
 #define CFX_IntArray                            CFX_ArrayTemplate<int>
 
 class  CPDFSDK_DateTime : public CFX_Object
 {
 public:
         CPDFSDK_DateTime();
         CPDFSDK_DateTime(const CFX_ByteString& dtStr);
         CPDFSDK_DateTime(const CPDFSDK_DateTime& datetime);
         CPDFSDK_DateTime(const FX_SYSTEMTIME& st);
         
@@ skipping 149 matching lines @@
         CPDFSDK_PageView*       m_pPageView;
         FX_BOOL                         m_bSelected;
         int                                     m_nTabOrder;
         
 };
 
 
 
 #endif