Add big endian (mips and mips64) support to BUILD.gn

- icudt[lb]_dat.S (assembly source) is generated at build-time from
  icudt[lb].dat (data bundle) when icu_use_data_file is false.
- icudt[lb].dat is copied depending on the endinaness when icu_use_data_file
  is true.

Part 1:  https://codereview.chromium.org/2162393003
Part 2:  https://codereview.chromium.org/2165403003

It works on Linux (both Chrome and v8) and Mac (v8).
Android was also tested by building base_unittests target with
icu_use_data_file=true/false.

v8 does not yet support mips/mips64 in GN so that this CL cannot be
tested with target_cpu={mips,mips64}.

With Chrome on Mac, TEST below has to be done with
https://codereview.chromium.org/2181043003 for http://crbug.com/630929.

Windows should not be affected at all.

BUG=v8:4828
TEST='gn args <builddir>' with icu_use_data_file set to true or false
TEST=build base_unittests and run with --gtest_filter=ICU*
TEST=build base_unittests and run with --gtest_filter=Message*ormat*
TEST=build 'd8' (v8) and try `(new Date()).toLocaleString("de")`
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/2174993002 .

BUG=pdfium:38
R=jshin@chromium.org

Review URL: https://codereview.chromium.org/2119023002 .

BUG=610673
R=alexclarke@chromium.org, dpranke@chromium.org

Review URL: https://codereview.chromium.org/1991833002 .

1. Update the IANA tz data to 2016c

What's new in 2016b and 2016c are found at

  http://mm.icann.org/pipermail/tz-announce/2016-March/000036.html (2016b)
  http://mm.icann.org/pipermail/tz-announce/2016-March/000037.html (2016c)

2. Locale data fixes
  - en-AU date format fix from the upstream
  - ar and fa: Prepend 'percent sign' with RTL mark (U+200F). From Android.
  - tr: Use ₺ (U+20BA; Turkish Lira Sign) instead of 'TL'. This is to revert a locale patch picked up from Google's internal build of ICU. (Android also uses U+20BA).

In addition, icudtl.dat (the prebuilt ICU data file for platforms other than
Android is moved out of source/data/in to common/. This way, the data build
steps for non-Android and Android can be unified and a bit more streamlined.
icu.gyp and BUILD.gn are updated accordingly as well as README.chromium.

BUG=598000
TEST=See bug comment 0 and comment 1
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1823293002 .

ICU in Chromium is compiled with exception disabled [1], but
U_NOEXCEPT is set to 'noexcept'  regardless of whether _HAS_EXCEPTION is set to 0 or (in source/common/unicode/platform.h ). [2].

Set U_NOEXCEPT to empty in our build files to avoid this issue.

[1] http://bugs.icu-project.org/trac/ticket/8343
[2] http://bugs.icu-project.org/trac/ticket/12406

BUG=575007
TEST=Build on Windows with MSVS 2015 succeeds.
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/1816673002 .

BUG=297668
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1755473004 .

MSVC complains about '*/* foobar */'. Add a space between '*' and '/'.

ICU uses a deprecated API internally and '-Wno-deprecated...' flag
has to be turned on on Android as well as on Linux.

Do not use ''-Wno-reorder' any more because it's not necessary.

BUG=575007
TEST=Once rolled, Android and Windows build go through.
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/1646623006 .

* Update the pre-built ICU data files for all platforms

  source/data/in/icudtl.dat for non-Android platforms
  {linux,mac}/icudt*.S for linux/mac
  android/icudtl.dat and android/icudt*.S for Android
  windows/icudt.dll for Windows

* Update Android data trimming script

  1. Make sure that 'default' calendar is kept in locales where it's relevant
    : root, th, fa, ar_SA, etc.
  2. Add a minimal region data to work around a bug in ICU with pool.res
     handling

* Update gn and gyp files
* And add a TODO comment to update.sh to automate the build file update.
* Add it_CH to the locale list.
* Add sr_Latn to unit/reslocal.mk (required by sh) and
  line_normal_fi to brkitr/brklocal.mk (referred to in brkitr/fi.txt) in
  place of line_fi.

* Update and add scripts for data building
* Completely rewrite README.chromium
* Check-in the prebuilt ICU data files/assembly sources for
  Linux,Mac,Windows,Chrome OS and Android.

BUG=575007
TEST=Blink layout tests, webkit unittests
TEST=All bots can build successfully
TEST=net_unittests --gtest_filter="*ilenameUtil*"
TEST=net_unittests --gtest_filter="*IDN*" (pending bug 336973)
TEST=base_unittests --gtest_filter="*Conv*"
TEST=browser_tests --gtest_filter="*ncoding*"
TEST=base_unittests --gtest_filter="*essage*"
TEST=ui_base_unittests --gtest_filter="*ormat*"
TEST=ui_base_unittests --gtest_filter="L10n*"
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1639543006 .

The new GN rule will enable removal of code which copies icudtl.dat in Android
GN code (for instance "copy_content_shell_assets").

BUG=547162
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1419583008 .

Previously GN would implicitly make a group's deps public. I'm making this behave like other target types, so ICU's group's deps need to be public to forward the build information to dependents.

TBR=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1374173003 .

Also add a few comments to the .gn file.

BUG=505316
R=jshin@chromium.org

Review URL: https://codereview.chromium.org/1301493002 .

The Chromium build currently defines both is_component_build (boolean)
and component_mode (a string). We're trying to standardize on the boolean.

TBR=jshin

Review URL: https://codereview.chromium.org/1273843002 .

No intended behavior change (except fewer duplicated compiler flags).

BUG=505319
TBR=mgiuca@chromium.org

Review URL: https://codereview.chromium.org/1220363002.

This warning is currently globally suppressed in Chromium, but this
suppression will be switched off, making a local suppression necessary.

BUG=505319
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/1224463003.

BUG=505304
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/1215103002.

Some Windows-specific ICU code uses this pattern, which triggers a clang warning.

BUG=505302
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/1209413007.

R=brettw@chromium.org, dpranke@chromium.org

Review URL: https://codereview.chromium.org/1183493003.

This allows targets that use GN to correctly note that
they need the .dat file to be included in .isolates.

R=brettw@chromium.org, jshin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1167613003.

I hang my head in shame.

BUG=498033
TBR=hans@chromium.org

Review URL: https://codereview.chromium.org/1177533002.

This ports https://codereview.chromium.org/515263002/ and
https://codereview.chromium.org/508343002/

I don't see these warnings locally, but they do show up on the bots
for some reason. Probably good to have gyp and gn match anyways.

BUG=498033
R=hans@chromium.org

Review URL: https://codereview.chromium.org/1171153002

1. -Wno-return-type-c-linkage
 - became unnecessary with ICU bug 9504 fixed 3 years ago.
 - remove from both BUILD.gn and icu.gyp

2. -Wnoheader-hygine
 - became unnecessary a long time ago.
 - remove from BUILD.gn (icu.gyp does not have it)

3. -Wstring-conversion and -Wheader-hygine
 - add to BUILD.gn by NOT excluding clang:extra_warnings

BUG=114660
TEST=Build icuuc/icui18n targets (both gyp and GN) after regenerating build files.
R=brettw@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/1158933005

The GYP and GN build's defines have diverged. THis brings GN's defines in line with GYP's current set.

R=jshin@chromium.org

Review URL: https://codereview.chromium.org/1130383003

1. Cherry-pick security patches from the upstream.
  a. BiDi: integer overflow
    http://bugs.icu-project.org/trac/ticket/11451
    http://crbug.com/451799
    bidi.patch was updated to include patches for this issue.
  b. data race in cmemory; remove an unnecessary check with a global variable.
    http://bugs.icu-project.org/trac/ticket/11538
    http://crbug.com/223352
    cmemory.patch was added
  c. Locale::getBaseName() thread-safety
    http://bugs.icu-project.org/trac/ticket/11547
    http://crbug.com/467836
    locid.patch was updated to include patches for this issue.

2. Add UCONFIG_NO_NON_HTML5_CONVERSION=1 to BUILD.gn

3. Clean up
  a. Update README.chromium to flag patches that are already in the upstream.
  b. Split pkg_gen.patch from data.build.patch. pkg_gen.patch was already
     in the upstream while the rest of data.build.patch is Chromium-specific.
  c. Delete an unused converters.patch.

BUG=223352,451799,467836
TEST=See bugs 223352, 467836, 468716, and 466838
R=jyasskin@chromium.org, mark@chromium.org

Review URL: https://codereview.chromium.org/1020303002

I forgot to include this change in
  https://codereview.chromium.org/984233002

TBR=jochen@chromium.org
BUG=NONE

Review URL: https://codereview.chromium.org/1021673003

BUG=none
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1014393002