Return error information from pdfium to JS.

fpdfsdk/include/javascript/resource.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 FPDFSDK_INCLUDE_JAVASCRIPT_RESOURCE_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_RESOURCE_H_
 
 #include "../../../core/include/fxcrt/fx_basic.h"  // For CFX_WideString.
 #include "../fsdk_define.h"  // For FX_UINT.
 
 class CJS_Context;
 
 #define IDS_STRING_JSALERT              25613
 #define IDS_STRING_JSPARAMERROR         25614
 #define IDS_STRING_JSAFNUMBER_KEYSTROKE 25615
 #define IDS_STRING_JSPARAM_TOOLONG      25617
 #define IDS_STRING_JSPARSEDATE          25618
 #define IDS_STRING_JSRANGE1             25619
 #define IDS_STRING_JSRANGE2             25620
 #define IDS_STRING_JSRANGE3             25621
 #define IDS_STRING_NOTSUPPORT           25627
 #define IDS_STRING_JSBUSY               25628
 #define IDS_STRING_JSEVENT              25629
 #define IDS_STRING_RUN                  25630
 #define IDS_STRING_JSPRINT1             25632
 #define IDS_STRING_JSPRINT2             25633
-#define IDS_JSPARAM_INCORRECT           25635
+#define IDS_STRING_JSNOGLOBAL           25635
+#define IDS_STRING_JSREADONLY           25636
 
 CFX_WideString JSGetStringFromID(CJS_Context* pContext, FX_UINT id);
+CFX_WideString JSFormatErrorString(const char* class_name,
+                                   const char* property_name,
+                                   const CFX_WideString& details);
 
 #endif  // FPDFSDK_INCLUDE_JAVASCRIPT_RESOURCE_H_