Update tz db to 2015b

scripts/update_tz.sh

+#!/bin/bash
+# Copyright (c) 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Download the 4 files below from the ICU data repository ($baseurl below) and
+# put them in source/data/misc to update the IANA timezone database in ICU.
+#
+#   metaZones.txt timezoneTypes.txt windowsZones.txt zoneinfo64.txt
+#
+# For IANA Time zone database, see https://www.iana.org/time-zones
+
+if [ $# -lt 1 ];
+then
+  echo "Usage: $0 version (e.g. '2015b')"
+  exit 1
+fi
+
+version=$1
+baseurl="http://source.icu-project.org/repos/icu/data/trunk/tzdata/icunew/"
+outputdir="$(dirname "$0")/../source/data/misc"
+
+# The latest ICU version for which the timezone data format changed in
+# an incompatible manner.
+# For a given IANA tz db version (e.g. 2015b),
+#  http://source.icu-project.org/repos/icu/data/trunk/tzdata/icunew/${version}
+# has subdirectories for different ICU data versions. As of April 2015, 44
+# is the latest even though the latest ICU release is 55.
+icudataversion=44
+
+sourcedirurl="${baseurl}/${version}/${icudataversion}"
+
+for f in metaZones.txt timezoneTypes.txt windowsZones.txt zoneinfo64.txt
+do
+  wget -O "${outputdir}/${f}" "${sourcedirurl}/${f}"
+done