Update tz db to 2015b

README.chromium

 Name: icu
 URL: http://site.icu-project.org/
 Version: 54.1
 License: MIT
 Security Critical: yes
 
 Description:
 This directory contains the source code of ICU 54.1 for C/C++.
 
 
@@ skipping 118 matching lines @@
     for ckb to 'Kurdish (Arabic)'.
 
   - android/patch_locale.sh (to be run for Android build only):
       a. Make changes to source/data/{region,lang} to exclude these data
          except the language and script names of zh_Hans and zh_Hant.
       b. Remove exemplar cities in timezone data (data/zone).
       c. Keep only the minimal calendar data in data/locales.
       d. Include currency display names for a smaller subset of currencies.
       e. Minimize the locale data for 9 locales to which Chrome on Android
          is not localized.
+      f. Also apply android/brkitr.patch
 
 6. Timezone data update
   - Grab the latest version of the following timezone data files and
-    put them in source/data/misc.
+    put them in source/data/misc using scripts/update_tz.sh
 
      metaZones.txt
      timezoneTypes.txt
      windowsZones.txt
      zoneinfo64.txt
 
-   As of January 2015, the latest version is 2015a and the above files
+   As of April 1 2015, the latest version is 2015b and the above files
    are available at
-   http://source.icu-project.org/repos/icu/data/trunk/tzdata/icunew/2015a/44/
+   http://source.icu-project.org/repos/icu/data/trunk/tzdata/icunew/2015b/44/
 
 7. Transliterator customization
 
    - Also add css3transform.txt to source/data/trnslit.
    - Put the following line in trnslocal.mk
 
      TRANSLIT_SOURCE=css3transform.txt
 
 8. Build-related changes
 
@@ skipping 17 matching lines @@
       http://bugs.icu-project.org/trac/ticket/10572
   - patches/data.build.win.patch :
       Windows-only data build patch.
   - patches/data_symb.patch :
       Put ICU_DATA_ENTRY_POINT(icudtXX_dat) in common when we use
       the icu data file or icudt.dll
 
 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.
+       and cd to that directory, $ICUBUILDIR.
     b. Run
 
       ${CHROME_ICU_TREE_TOP}/source/runConfigureICU Linux --disable-layout
 
     c. Run 'make'
-    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.
+    d. 'make' will fail  when pkgdata looks for css3transform.res.
+       See http://bugs.icu-project.org/trac/ticket/10570
+    e. run
 
+         ${CHROME_ICU_TREE_TOP}/scripts/make_n_copy_data.sh
+
+       This will make and copy icudtl.dat and icudtl_dat.S for Linux and
+       Mac as listed below. Renaming the data/assembly files to drop
+       the ICU major version number as well as running make_mac_assembly.sh
+       is done by this script.
+
+       This script can be run again whenever you update the data.
 
     - source/data/in/icudtl.dat : Built on Linux with all the patches
       above applied. icudt54l.dat is generated in
       {BUILD_DIR_ROOT}/data/out/tmp and copied to the above location with a
       version number (54) dropped.
 
 
     - {mac,linux}/icudtl_dat.S : Built on Linux with all the
       patches above (except android/brkitr.patch) applied and checked in.
       This file will be generated in {BUILD_DIR_ROOT}/data/out/tmp as
       icudt54l_dat.S, but '54' is dropped while copying.
 
       mac/icudtl_dat.S is identical to linux/icudtl_dat.S except for
       the header portion. With "linux/icudtl_dat.S" in its place,
-      run scripts/make_mac_assembly.sh to generate it.
 
     - android/icudtl_dat.S : Built on Linux with all the patches above and
-      android/brkitr.patch applied and android/patch_locale.sh executed.
+      android/patch_locale.sh executed.
       '54' is dropped from the name generated in the build tree.
 
     - android/icudtl.dat : Generated as icudt54l.dat in
       {BUILD_DIR_ROOT}/data/out/tmp along with icudt54l_dat.S and
       copied to the above location with '54' dropped in its name.
 
     - windows/icudt.dll (by default, we set icu_use_icu_data_flag to 1
       and don't use this file.)
 
       a. check out a clean copy of icu54  from the upstream on Windows
@@ skipping 34 matching lines @@
 13. Fix a data race in cmemory
    - patches/cmemory.patch
    - upstream bug (fixed in the upstream 55 RC)
      http://www.icu-project.org/trac/ticket/11538
 
 14. Fix a bug found by 'stack' (static analysis tool)
    - patches/uloc.patch
    - upstream bug
      http://www.icu-project.org/trac/ticket/11602