Add ostream helpers for FX String classes.

core/include/fxcrt/fx_string.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 _FX_STRING_H_
 #define _FX_STRING_H_
 class CFX_ByteStringC;
 class CFX_ByteString;
 class CFX_WideStringC;
 class CFX_WideString;
 struct CFX_CharMap;
 class CFX_BinaryBuf;
 typedef int FX_STRSIZE;
 class CFX_ByteStringL;
 class CFX_WideStringL;
 class CFX_ByteStringC : public CFX_Object
 {
 public:
+    typedef FX_CHAR value_type;
 
     CFX_ByteStringC()
     {
         m_Ptr = NULL;
         m_Length = 0;
     }
 
     CFX_ByteStringC(FX_LPCBYTE ptr, FX_STRSIZE size)
     {
         m_Ptr = ptr;
@@ skipping 122 matching lines @@
 
     FX_STRSIZE  m_nDataLength;
 
     FX_STRSIZE  m_nAllocLength;
 
     FX_CHAR             m_String[1];
 };
 class CFX_ByteString : public CFX_Object
 {
 public:
+    typedef FX_CHAR value_type;
 
     CFX_ByteString()
     {
         m_pData = NULL;
     }
 
     CFX_ByteString(const CFX_ByteString& str);
 
     CFX_ByteString(char ch);
 
@@ skipping 293 matching lines @@
 public:
 
     CFX_StringBufTemplate() : CFX_StringBufBase(limit) {}
 
     FX_CHAR             m_Buffer[limit];
 };
 typedef CFX_StringBufTemplate<256> CFX_StringBuf256;
 class CFX_WideStringC : public CFX_Object
 {
 public:
+    typedef FX_WCHAR value_type;
 
     CFX_WideStringC()
     {
         m_Ptr = NULL;
         m_Length = 0;
     }
 
     CFX_WideStringC(FX_LPCWSTR ptr)
     {
         m_Ptr = ptr;
@@ skipping 125 matching lines @@
 
     FX_STRSIZE  m_nDataLength;
 
     FX_STRSIZE  m_nAllocLength;
 
     FX_WCHAR    m_String[1];
 };
 class CFX_WideString : public CFX_Object
 {
 public:
+    typedef FX_WCHAR value_type;
 
     CFX_WideString()
     {
         m_pData = NULL;
     }
 
     CFX_WideString(const CFX_WideString& str);
 
     CFX_WideString(FX_LPCWSTR ptr, FX_STRSIZE len = -1)
     {
@@ skipping 220 matching lines @@
 CFX_ByteString  FX_UTF8Encode(FX_LPCWSTR pwsStr, FX_STRSIZE len);
 inline CFX_ByteString   FX_UTF8Encode(FX_WSTR wsStr)
 {
     return FX_UTF8Encode(wsStr.GetPtr(), wsStr.GetLength());
 }
 inline CFX_ByteString   FX_UTF8Encode(const CFX_WideString &wsStr)
 {
     return FX_UTF8Encode(wsStr.c_str(), wsStr.GetLength());
 }
 #endif