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1diff --git a/build/linux/unbundle/icu.gn b/build/linux/unbundle/icu.gn
2new file mode 100644
3index 00000000000..9e54d4efe4e
4--- /dev/null
5+++ b/build/linux/unbundle/icu.gn
6@@ -0,0 +1,262 @@
7+# Copyright 2016 The Chromium Authors
8+# Use of this source code is governed by a BSD-style license that can be
9+# found in the LICENSE file.
10+
11+import("//build/config/linux/pkg_config.gni")
12+import("//build/shim_headers.gni")
13+
14+group("icu") {
15+ public_deps = [
16+ ":icui18n",
17+ ":icuuc",
18+ ]
19+}
20+
21+config("icu_config") {
22+ defines = [
23+ "USING_SYSTEM_ICU=1",
24+ "ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC",
25+
26+ # U_EXPORT (defined in unicode/platform.h) is used to set public visibility
27+ # on classes through the U_COMMON_API and U_I18N_API macros (among others).
28+ # When linking against the system ICU library, we want its symbols to have
29+ # public LTO visibility. This disables CFI checks for the ICU classes and
30+ # allows whole-program optimization to be applied to the rest of Chromium.
31+ #
32+ # Both U_COMMON_API and U_I18N_API macros would be defined to U_EXPORT only
33+ # when U_COMBINED_IMPLEMENTATION is defined (see unicode/utypes.h). Because
34+ # we override the default system UCHAR_TYPE (char16_t), it is not possible
35+ # to use U_COMBINED_IMPLEMENTATION at this moment, meaning the U_COMMON_API
36+ # and U_I18N_API macros are set to U_IMPORT which is an empty definition.
37+ #
38+ # Until building with UCHAR_TYPE=char16_t is supported, one way to apply
39+ # public visibility (and thus public LTO visibility) to all ICU classes is
40+ # to define U_IMPORT to have the same value as U_EXPORT. For more details,
41+ # please see: https://crbug.com/822820
42+ "U_IMPORT=U_EXPORT",
43+ ]
44+}
45+
46+pkg_config("system_icui18n") {
47+ packages = [ "icu-i18n" ]
48+}
49+
50+pkg_config("system_icuuc") {
51+ packages = [ "icu-uc" ]
52+}
53+
54+source_set("icui18n") {
55+ public_deps = [ ":icui18n_shim" ]
56+ public_configs = [
57+ ":icu_config",
58+ ":system_icui18n",
59+ ]
60+}
61+
62+source_set("icuuc") {
63+ public_deps = [ ":icuuc_shim" ]
64+ public_configs = [
65+ ":icu_config",
66+ ":system_icuuc",
67+ ]
68+}
69+
70+group("icui18n_hidden_visibility") {
71+ public_deps = [ ":icui18n" ]
72+}
73+
74+group("icuuc_hidden_visibility") {
75+ public_deps = [ ":icuuc" ]
76+}
77+
78+shim_headers("icui18n_shim") {
79+ root_path = "source/i18n"
80+ headers = [
81+ # This list can easily be updated using the commands below:
82+ # cd third_party/icu/source/i18n
83+ # find unicode -iname '*.h' -printf ' "%p",\n' | LC_ALL=C sort -u
84+ "unicode/alphaindex.h",
85+ "unicode/basictz.h",
86+ "unicode/calendar.h",
87+ "unicode/choicfmt.h",
88+ "unicode/coleitr.h",
89+ "unicode/coll.h",
90+ "unicode/compactdecimalformat.h",
91+ "unicode/curramt.h",
92+ "unicode/currpinf.h",
93+ "unicode/currunit.h",
94+ "unicode/datefmt.h",
95+ "unicode/dcfmtsym.h",
96+ "unicode/decimfmt.h",
97+ "unicode/dtfmtsym.h",
98+ "unicode/dtitvfmt.h",
99+ "unicode/dtitvinf.h",
100+ "unicode/dtptngen.h",
101+ "unicode/dtrule.h",
102+ "unicode/fieldpos.h",
103+ "unicode/fmtable.h",
104+ "unicode/format.h",
105+ "unicode/fpositer.h",
106+ "unicode/gender.h",
107+ "unicode/gregocal.h",
108+ "unicode/listformatter.h",
109+ "unicode/measfmt.h",
110+ "unicode/measunit.h",
111+ "unicode/measure.h",
112+ "unicode/msgfmt.h",
113+ "unicode/numfmt.h",
114+ "unicode/numsys.h",
115+ "unicode/plurfmt.h",
116+ "unicode/plurrule.h",
117+ "unicode/rbnf.h",
118+ "unicode/rbtz.h",
119+ "unicode/regex.h",
120+ "unicode/region.h",
121+ "unicode/reldatefmt.h",
122+ "unicode/scientificnumberformatter.h",
123+ "unicode/search.h",
124+ "unicode/selfmt.h",
125+ "unicode/simpletz.h",
126+ "unicode/smpdtfmt.h",
127+ "unicode/sortkey.h",
128+ "unicode/stsearch.h",
129+ "unicode/tblcoll.h",
130+ "unicode/timezone.h",
131+ "unicode/tmunit.h",
132+ "unicode/tmutamt.h",
133+ "unicode/tmutfmt.h",
134+ "unicode/translit.h",
135+ "unicode/tzfmt.h",
136+ "unicode/tznames.h",
137+ "unicode/tzrule.h",
138+ "unicode/tztrans.h",
139+ "unicode/ucal.h",
140+ "unicode/ucol.h",
141+ "unicode/ucoleitr.h",
142+ "unicode/ucsdet.h",
143+ "unicode/udat.h",
144+ "unicode/udateintervalformat.h",
145+ "unicode/udatpg.h",
146+ "unicode/ufieldpositer.h",
147+ "unicode/uformattable.h",
148+ "unicode/ugender.h",
149+ "unicode/ulocdata.h",
150+ "unicode/umsg.h",
151+ "unicode/unirepl.h",
152+ "unicode/unum.h",
153+ "unicode/unumsys.h",
154+ "unicode/upluralrules.h",
155+ "unicode/uregex.h",
156+ "unicode/uregion.h",
157+ "unicode/ureldatefmt.h",
158+ "unicode/usearch.h",
159+ "unicode/uspoof.h",
160+ "unicode/utmscale.h",
161+ "unicode/utrans.h",
162+ "unicode/vtzone.h",
163+ ]
164+}
165+
166+shim_headers("icuuc_shim") {
167+ root_path = "source/common"
168+ headers = [
169+ # This list can easily be updated using the commands below:
170+ # cd third_party/icu/source/common
171+ # find unicode -iname '*.h' -printf ' "%p",\n' | LC_ALL=C sort -u
172+ "unicode/appendable.h",
173+ "unicode/brkiter.h",
174+ "unicode/bytestream.h",
175+ "unicode/bytestrie.h",
176+ "unicode/bytestriebuilder.h",
177+ "unicode/caniter.h",
178+ "unicode/casemap.h",
179+ "unicode/char16ptr.h",
180+ "unicode/chariter.h",
181+ "unicode/dbbi.h",
182+ "unicode/docmain.h",
183+ "unicode/dtintrv.h",
184+ "unicode/edits.h",
185+ "unicode/enumset.h",
186+ "unicode/errorcode.h",
187+ "unicode/filteredbrk.h",
188+ "unicode/icudataver.h",
189+ "unicode/icuplug.h",
190+ "unicode/idna.h",
191+ "unicode/localematcher.h",
192+ "unicode/localpointer.h",
193+ "unicode/locdspnm.h",
194+ "unicode/locid.h",
195+ "unicode/messagepattern.h",
196+ "unicode/normalizer2.h",
197+ "unicode/normlzr.h",
198+ "unicode/parseerr.h",
199+ "unicode/parsepos.h",
200+ "unicode/platform.h",
201+ "unicode/ptypes.h",
202+ "unicode/putil.h",
203+ "unicode/rbbi.h",
204+ "unicode/rep.h",
205+ "unicode/resbund.h",
206+ "unicode/schriter.h",
207+ "unicode/simpleformatter.h",
208+ "unicode/std_string.h",
209+ "unicode/strenum.h",
210+ "unicode/stringpiece.h",
211+ "unicode/stringtriebuilder.h",
212+ "unicode/symtable.h",
213+ "unicode/ubidi.h",
214+ "unicode/ubiditransform.h",
215+ "unicode/ubrk.h",
216+ "unicode/ucasemap.h",
217+ "unicode/ucat.h",
218+ "unicode/uchar.h",
219+ "unicode/ucharstrie.h",
220+ "unicode/ucharstriebuilder.h",
221+ "unicode/uchriter.h",
222+ "unicode/uclean.h",
223+ "unicode/ucnv.h",
224+ "unicode/ucnv_cb.h",
225+ "unicode/ucnv_err.h",
226+ "unicode/ucnvsel.h",
227+ "unicode/uconfig.h",
228+ "unicode/ucurr.h",
229+ "unicode/udata.h",
230+ "unicode/udisplaycontext.h",
231+ "unicode/uenum.h",
232+ "unicode/uidna.h",
233+ "unicode/uiter.h",
234+ "unicode/uldnames.h",
235+ "unicode/ulistformatter.h",
236+ "unicode/uloc.h",
237+ "unicode/umachine.h",
238+ "unicode/umisc.h",
239+ "unicode/unifilt.h",
240+ "unicode/unifunct.h",
241+ "unicode/unimatch.h",
242+ "unicode/uniset.h",
243+ "unicode/unistr.h",
244+ "unicode/unorm.h",
245+ "unicode/unorm2.h",
246+ "unicode/uobject.h",
247+ "unicode/urename.h",
248+ "unicode/urep.h",
249+ "unicode/ures.h",
250+ "unicode/uscript.h",
251+ "unicode/uset.h",
252+ "unicode/usetiter.h",
253+ "unicode/ushape.h",
254+ "unicode/usprep.h",
255+ "unicode/ustring.h",
256+ "unicode/ustringtrie.h",
257+ "unicode/utext.h",
258+ "unicode/utf.h",
259+ "unicode/utf16.h",
260+ "unicode/utf32.h",
261+ "unicode/utf8.h",
262+ "unicode/utf_old.h",
263+ "unicode/utrace.h",
264+ "unicode/utypes.h",
265+ "unicode/uvernum.h",
266+ "unicode/uversion.h",
267+ ]
268+}
269diff --git a/build/linux/unbundle/replace_gn_files.py b/build/linux/unbundle/replace_gn_files.py
270new file mode 100755
271index 00000000000..1aed7bca99d
272--- /dev/null
273+++ b/build/linux/unbundle/replace_gn_files.py
274@@ -0,0 +1,65 @@
275+#!/usr/bin/env python3
276+# Copyright 2016 The Chromium Authors
277+# Use of this source code is governed by a BSD-style license that can be
278+# found in the LICENSE file.
279+
280+"""
281+Replaces GN files in tree with files from here that
282+make the build use system libraries.
283+"""
284+
285+import argparse
286+import os
287+import shutil
288+import sys
289+
290+
291+REPLACEMENTS = {
292+ 'icu': 'third_party/icu/BUILD.gn',
293+ 'protobuf': 'build/secondary/third_party/protobuf/BUILD.gn',
294+ 'zlib': 'third_party/zlib/BUILD.gn',
295+}
296+
297+
298+def DoMain(argv):
299+ my_dirname = os.path.dirname(__file__)
300+ source_tree_root = os.path.abspath(
301+ os.path.join(my_dirname, '..', '..', '..'))
302+
303+ parser = argparse.ArgumentParser()
304+ parser.add_argument('--system-libraries', nargs='*', default=[])
305+ parser.add_argument('--undo', action='store_true')
306+
307+ args = parser.parse_args(argv)
308+
309+ handled_libraries = set()
310+ for lib, path in REPLACEMENTS.items():
311+ if lib not in args.system_libraries:
312+ continue
313+ handled_libraries.add(lib)
314+
315+ if args.undo:
316+ # Restore original file, and also remove the backup.
317+ # This is meant to restore the source tree to its original state.
318+ os.rename(os.path.join(source_tree_root, path + '.orig'),
319+ os.path.join(source_tree_root, path))
320+ else:
321+ # Create a backup copy for --undo.
322+ shutil.copyfile(os.path.join(source_tree_root, path),
323+ os.path.join(source_tree_root, path + '.orig'))
324+
325+ # Copy the GN file from directory of this script to target path.
326+ shutil.copyfile(os.path.join(my_dirname, '%s.gn' % lib),
327+ os.path.join(source_tree_root, path))
328+
329+ unhandled_libraries = set(args.system_libraries) - handled_libraries
330+ if unhandled_libraries:
331+ print('Unrecognized system libraries requested: %s' % ', '.join(
332+ sorted(unhandled_libraries)), file=sys.stderr)
333+ return 1
334+
335+ return 0
336+
337+
338+if __name__ == '__main__':
339+ sys.exit(DoMain(sys.argv[1:]))
340diff --git a/build/linux/unbundle/zlib.gn b/build/linux/unbundle/zlib.gn
341new file mode 100644
342index 00000000000..fa2bbffd25f
343--- /dev/null
344+++ b/build/linux/unbundle/zlib.gn
345@@ -0,0 +1,63 @@
346+# Copyright 2016 The Chromium Authors
347+# Use of this source code is governed by a BSD-style license that can be
348+# found in the LICENSE file.
349+
350+import("//build/shim_headers.gni")
351+
352+shim_headers("zlib_shim") {
353+ root_path = "."
354+ headers = [ "zlib.h" ]
355+ additional_includes = [ "third_party" ]
356+
357+}
358+
359+config("system_zlib") {
360+ defines = [ "USE_SYSTEM_ZLIB=1" ]
361+}
362+
363+config("zlib_config") {
364+ configs = [ ":system_zlib" ]
365+}
366+
367+source_set("zlib") {
368+ public_deps = [ ":zlib_shim" ]
369+ libs = [ "z" ]
370+ public_configs = [ ":system_zlib" ]
371+}
372+
373+shim_headers("minizip_shim") {
374+ root_path = "contrib"
375+ headers = [
376+ "minizip/crypt.h",
377+ "minizip/ioapi.h",
378+ "minizip/iowin32.h",
379+ "minizip/mztools.h",
380+ "minizip/unzip.h",
381+ "minizip/zip.h",
382+ ]
383+}
384+
385+source_set("minizip") {
386+ deps = [ ":minizip_shim" ]
387+ libs = [ "minizip" ]
388+}
389+
390+static_library("zip") {
391+ sources = [
392+ "google/zip.cc",
393+ "google/zip.h",
394+ "google/zip_internal.cc",
395+ "google/zip_internal.h",
396+ "google/zip_reader.cc",
397+ "google/zip_reader.h",
398+ ]
399+ deps = [ ":minizip" ]
400+}
401+
402+static_library("compression_utils") {
403+ sources = [
404+ "google/compression_utils.cc",
405+ "google/compression_utils.h",
406+ ]
407+ deps = [ ":zlib" ]
408+}
409diff --git a/build/shim_headers.gni b/build/shim_headers.gni
410index dc57d12ed0c..1d24e0ad00e 100644
411--- a/build/shim_headers.gni
412+++ b/build/shim_headers.gni
413@@ -7,6 +7,11 @@ template("shim_headers") {
414 shim_headers_path = "${root_gen_dir}/shim_headers/${target_name}"
415 config(config_name) {
416 include_dirs = [ shim_headers_path ]
417+ if (defined(invoker.additional_includes)) {
418+ foreach(i, invoker.additional_includes) {
419+ include_dirs += [ shim_headers_path + "/" + i ]
420+ }
421+ }
422 }
423 action(action_name) {
424 script = "//tools/generate_shim_headers.py"
425@@ -26,11 +31,12 @@ template("shim_headers") {
426 args += invoker.headers
427 outputs = []
428 foreach(h, invoker.headers) {
429- outputs += [ shim_headers_path + "/" + rebase_path(invoker.root_path,"//") + "/" + h ]
430+ outputs += [ shim_headers_path + "/" +
431+ rebase_path(invoker.root_path, "//") + "/" + h ]
432 }
433 }
434 group(target_name) {
435- deps = [ ":${action_name}" ]
436+ public_deps = [ ":${action_name}" ]
437 all_dependent_configs = [ ":${config_name}" ]
438 }
439 }