Add U+2212 to Japanese converters and update GBK/gb18030 aliases/tables

source/data/mappings/convrtrs.txt

 # ******************************************************************************
 # *
 # *   Copyright (C) 1995-2014, International Business Machines
 # *   Corporation and others.  All Rights Reserved.
 # *
 # ******************************************************************************
 
 # If this converter alias table looks very confusing, a much easier to
 # understand view can be found at this demo:
 # http://demo.icu-project.org/icu-bin/convexp
@@ skipping 119 matching lines @@
 utf-16be { MIME* HTML* }
 
 utf-16le { MIME* HTML* }
     utf-16
 
 # Keep UTF-32 entries for now until we sort out Blink's behavior when
 # UTF-32 is dropped.
 UTF-32 { IANA* MIME* }          ISO-10646-UCS-4 { IANA }
                                 csUCS4
                                 ucs-4
-UTF-32BE { IANA* }              UTF32_BigEndian
-UTF-32LE { IANA* }              UTF32_LittleEndian
+# Until we kill UTF-32 in Blink, add MIME tag here.
+UTF-32BE { MIME* IANA* }              UTF32_BigEndian
+UTF-32LE { MIME* IANA* }              UTF32_LittleEndian
 
 ibm866-html
     IBM866 { MIME* HTML* }
     866
     cp866
     csibm866
 
 iso-8859-2-html
     ISO-8859-2 { MIME* HTML* }
     csisolatin2
@@ skipping 72 matching lines @@
     csiso88598e { MIME }
     csisolatinhebrew
     hebrew
     ISO-8859-8-E
     ISO-8859-8-I
     iso-ir-138
     iso8859-8
     iso88598
     iso_8859-8
     iso_8859-8:1988
+    visual
     # adding this one leads to a failure in encoding-labels.html
 #   csiso88598i
 
 
 # This alias has to be dealt with by TextCodecICU unless
 # multiple encodings can share a single mapping table.
 #ISO-8859-8-I { MIME* HTML* }
 #   csiso88598i
 #   logical
 
@@ skipping 122 matching lines @@
 x-mac-cyrillic-html
     x-mac-cyrillic { MIME* HTML* }
     x-mac-ukrainian
 
 # Keep GBK and GB18030 separate for now until we decide
 # what to do about them: crbug.com/339862
 # The encoding spec requires that decoding to Unicode should use GB18030
 # while encoding from Unicode should use GBK.
 
 windows-936-2000
-                       GB2312 { IANA MIME }
                        GBK { MIME* IANA* }
                        CP936 { IANA }
                        MS936 { IANA }
-                       windows-936 { IANA }
                        chinese { IANA }
                        iso-ir-58 { IANA }
+                       GB2312 { IANA MIME }
+                       GB_2312-80 { IANA }
+                       gb_2312
                        gb2312-1980
+                       csGB2312 { IANA }
+                       csiso58gb231280
                        EUC-CN
-                       csGB2312 { IANA }
-                       GB_2312-80 { IANA }
                        x-gbk
+                       windows-936
 
 # GB 18030 is partly algorithmic, using the MBCS converter
 gb18030 { IANA* }      gb18030 { HTML* MIME* }  ibm-1392 windows-54936
 
 big5-html
     Big5 { MIME* HTML* }
     cn-big5
     csbig5
     x-x-big5
     Big5-HKSCS
@@ skipping 28 matching lines @@
     ksc_5601
     windows-949
 
 # We need to keep these aliases so that documents labelled with them
 # are converted to a single U+FFFD instead of being rendered as a gibberish.
 ISO-2022-KR { HTML* MIME* } csISO2022KR { IANA }
 ISO-2022-CN { IANA* HTML* } csISO2022CN  x-ISO-2022-CN-GB
 ISO-2022-CN-EXT { IANA* HTML* }
 HZ-GB-2312 { HTML* IANA* } HZ