* Highlights:
  - Emoji 5.0 data (partial; Emoji_Component property not included)
  - CLDR 31.0.1 (http://blog.unicode.org/2017/03/cldr-version-31-released.html)
    UTC and GMT are treated as distinct)
  - New case mapping API for styled text
  - C++ 11 is required
  - char16_t for UChar (UTF-16)
  - Source code is in UTF-8

* Size changes

  common: 10,130,560 => 10,175,056
  android: 6,573,872 => 6,616,864
  iOS: 6,562,352 => 6,605,152

On top of ICU 59.1 from the upstream, the following changes were applied.
See https://chromium.googlesource.com/chromium/deps/icu/+log/chromium/59staging

  - Fix C++ 11 string literal assignment issue (upstream bug: 13192)
  - Fix C4229 warning by MSVC
  - Apply utf32.patch and include unistr.h in fuzzer_util
  - Update ICU data files
  - Fix wpo.patch
  - Apply Google locale patch and locale1.patch
  - update readme
  - Apply breakiterator related patches
  - Apply and update wpo.patch
  - Drop unused patch, apply data.build.win.patch, update README.chromium
  - Add /utf-8 flag for Windows/Visual Studio
  - Update BUILD.gn for UChar, stubdata and apply data_sym.patch
  - use stubdata.cpp instead of stubdata.c in icu.gyp
  - Update icu.gyp* files for v8
  - Update BUILD.gn, apply data.build.patch and vscomp.patch
  - Add new files in ICU 59.1
  - Get a fresh copy of ICU 59.1 from the upstream
  - Update update.sh script

TBR=drott@chromium.org, yangguo@chromium.org
Bug:699469
TEST: layout tests, all unittests, browser tests
Change-Id: Ie1e77323aa0c7f872153680c4deca6471a771a5c
Reviewed-on: https://chromium-review.googlesource.com/505173


Reviewed-by: Jungshik Shin <jshin@chromium.org>

* Note that this CL will be followed by CLs with local changes.
  Until then, ICU should not be rolled in DEPS. See READ_THIS_FIRST
  for details.

* Adjust scripts/update.sh and scripts/data_files_to_preserve.txt
  - CLDR/ICU added ckb/ast locale data. Drop them from the list to preserve.
  - source/layout does not exist in 58.1 any more.

* Update the tree to ICU 58.1 from the upstream by running
  scripts/update.sh

* Update README.chromium and add READ_THIS_FIRST to warn about the
  status of the tree.

BUG=637001
TEST=None

Run scripts/update.sh to get icu 56.1 from the upstream while
preserving local configuration files and converter files.

BUG=575007
TEST=None

Review URL: https://codereview.chromium.org/1621843002 .

1. Replace 'src/' with a fresh copy of ICU 54.1 from the upstream.
2. Remove unncessary files/directories
3. Update the source/header file lists in icu.gypi and icu.gyp
4. Update README.chromium to warn that the ICU head is not usable for
   building Chromium/Blink/v8,yet.

BUG=428145
TEST=None

Review URL: https://codereview.chromium.org/845603002

The following directories we don't use are removed:

as_is
packaging
source/layout
source/layoutex

Better plural formatting, updated locale data, the segmentation support
for Chinese, Japanese (our code was upstreamed) and Khmer/Lao are among
many improvements. EcmaScript I18N API also need this update to be compliant
to the spec.

Because codereview.chromium.org keeps giving me a 500 error when uploading
the CL, so this initial check-in is done directly with svn.

BUG=132145
TEST=None


git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/icu52@259715 4ff67af0-8c30-449e-8e8b-ad334ec8d88c