ICU update to 54 step 3

README.chromium

 Name: icu
 URL: http://site.icu-project.org/
 Version: 54.1
 License: MIT
 Security Critical: yes
 
 WARNING: The head of third_party/icu is in the middle of upgrading to ICU 54.1
 and it's NOT usable for Chromium/Blink/v8.
  - DO NOT deps-roll ICU to the head.
  - If there is a critical change to make (e.g. security), a branch can be cut
@@ skipping 69 matching lines @@
 
 4. Converter changes :
 
   - convrtrs.txt : Replaced the original by our own that only lists encodings
     and aliases required by the WHATWG Encoding spec plus a few extra (see
     the file as to why).
 
   - Add source/data/mappings/ucmlocal.txt : to list only converters we need.
 
   - Add new tables per the WHATWG encoding standards for EUC-JP,
-    Shift_JIS and all the single byte encodings.
-    They're generated with scripts : scripts/{eucjp, sjis, single_byte}_gen.sh
+    Shift_JIS, Big5 (Big5+Big5HKSCS) and all the single byte encodings.
+    They're generated with scripts :
+      scripts/{eucjp,sjis,big5,single_byte}_gen.sh
+
+  - Add euc-kr-html.ucm along with scripts/euckr_gen.sh, but it's not
+    yet used pending the resolution of http://crbug.com/450312 and the
+    corresponding w3c encoding bug.
 
   - uconv.patch
     a. ISO-2022-JP-[1-4] is dropped.
     b. SCSU, BOCU, ISCII, UTF-7, LMB, ibm42*, ISO-2022-{KR,CN*} and HZ-GB  :
        converters and detectors are dropped leading to the ~100kB reduction
        in the code size.
 
+  - Upstream bugs
+    http://www.icu-project.org/trac/ticket/11296 (uconv.patch)
+    http://www.icu-project.org/trac/ticket/10303 (html5 encoding tables)
+
 
 5. Locale changes
   - patches/locale1.patch :
       a. Exemplar character set changes for zh*, ja + 9 Indian locales
       b. Minor fixes for Korean, a few Indic (AmPmMarkers) and
       others (datetime format)
 
   - Locale build configuration files: To include the full locale data
     for Chrome's UI languages and the minimum locale data for other locales,
     add reslocal.mk or {trns,sprep,rbnf,coll}local.mk files to
@@ skipping 57 matching lines @@
 
 9. Pre-built data files are checked in with the following steps on Linux:
 
     a. Make a icu data build directory outside the Chromium source tree
        and cd to that directory.
     b. Run
 
       ${CHROME_ICU_TREE_TOP}/source/runConfigureICU Linux --disable-layout
 
     c. Run 'make'
-    d. 'make' will fail in the 1st pass. Copy
-       ${CHROME_ICU_TREE_TOP}/source/data/in/coll/invuca.icu
-       to {BUILD_DIR_ROOT}/data/out/build/icudt52l/coll and re-run 'make'
-       in {BUILD_DIR_ROOT}/data.
-
-    e. 'make' will fail again when pkgdata looks for css3transform.res. Edit
-    data/out/tmp/icudata.lst to replace 'css3transform.res' with 'root.res'.
+    d. 'make' will fail  when pkgdata looks for css3transform.res. Edit
+      data/out/tmp/icudata.lst to replace 'css3transform.res' with 'root.res'.
     (see http://bugs.icu-project.org/trac/ticket/10570 ) and run 'make' again.
 
 
     - source/data/in/icudtl.dat : Built on Linux with all the patches
       above applied. icudt52l.dat is generated in
       {BUILD_DIR_ROOT}/data/out/tmp and copied to the above location with a
       version number (52) dropped.
 
 
     - {mac,linux}/icudtl_dat.S : Built on Linux with all the
@@ skipping 35 matching lines @@
 10. Apply the following patches for regex
    - patches/regex.patch (a combined patch of 3 revisions below)
    - upstream bugs (fixed in the upstream ToT) :
      http://bugs.icu-project.org/trac/ticket/11370 (r36723:36724)
      http://bugs.icu-project.org/trac/ticket/11369 (r36726:36727)
      http://bugs.icu-project.org/trac/ticket/11371 (r36800:36801)
 
 11. Fix a bug in locid (getBaseName is wrong).
    - patches/locid.patch
    - upstream bug: http://bugs.icu-project.org/trac/ticket/11421