Return error information from pdfium to JS.

fpdfsdk/include/javascript/IJavaScript.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 _IJAVASCRIPT_H_
 #define _IJAVASCRIPT_H_
 
+#include "../../../core/include/fxcrt/fx_basic.h"
+
+class CPDF_Bookmark;
+class CPDF_FormField;
+class CPDFSDK_Annot;
+class CPDFSDK_Document;
+
 class IFXJS_Context
 {
 public:
         virtual ~IFXJS_Context() { }
         virtual FX_BOOL                         Compile(const CFX_WideString& script, CFX_WideString& info) = 0;
         virtual FX_BOOL                         RunScript(const CFX_WideString& script, CFX_WideString& info) = 0;
 
         virtual void                            OnApp_Init() = 0;
 
         virtual void                            OnDoc_Open(CPDFSDK_Document* pDoc, const CFX_WideString& strTargetName) = 0;
@@ skipping 77 matching lines @@
         void                                                    ReleaseGlobalData();
 private:
         FX_BOOL m_bInit;
         int m_nRef;
         CJS_GlobalData*                                 m_pGlobalData;
         FX_INT32                                                m_nGlobalDataCount;
 };
 
 #endif //_IJAVASCRIPT_H_