Pass more hints to encoding detector.

third_party/WebKit/Source/platform/text/TextEncodingDetector.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef TextEncodingDetector_h
 #define TextEncodingDetector_h
 
 #include "platform/PlatformExport.h"
 #include <cstddef>
 
 namespace WTF {
+class String;
 class TextEncoding;
 }
 
 namespace blink {
 
 // Given a sequence of bytes in |data| of length |len| and an optional
 // hintEncodingName, detect the most likely character encoding.
 // The way hintEncodingName is used is up to an implementation.
 // Currently, the only caller sets it to the parent frame encoding.
+// |hintUrl| is optional. You can pass String().
+// |hintUserLanguage| is an optional language code like "fr".
 PLATFORM_EXPORT bool detectTextEncoding(const char* data,
                                         size_t length,
                                         const char* hintEncodingName,
+                                        const WTF::String& hintUrl,

[Jinsuk Kim, 2017/01/20 21:50:47]

Can this be of type const char* like other parameters unless there is a
particular reason?

[tkent, 2017/01/23 00:02:57]

Done.

+                                        const char* hintUserLanguage,
                                         WTF::TextEncoding* detectedEncoding);
 
 }  // namespace blink
 
 #endif