Roll GN from r1496 (0790d304) to r1555 (64b846c9)

https://gn.googlesource.com/gn.git/+log/0790d304..64b846c9

64b846c9 Fix -Wstring-plus-int errors in ninja_action_target_writer_unittest
5725aa86 Remove obsolete instruction on how to roll gn
30939f51 Remove dpranke from OWNERS.
dcab2f94 Fix issues with bundle_data/create_bundle targets
d46f92f4 Make all bundle_foo_dir properties optional
fb330c78 [gn] Always create "args.gn" file when running gn gen.
ac2776fd [desc] Add runtime_deps handler
f5fc0600 Support Visual Studio 2019 project generation.
b85982b3 visual_studio_writer: Make OutDir equal to $(SolutionDir).
9434c3d2 Make gen.py compatible with python3
b199e54b [docs] : Split 'gn help' heading and usage summary when exceed 80 cols
5bc90b63 stdout: use dim colors
24411bec Make gn check faster
3941394b [docs] regenerate docs/reference.md
93ac4e04 Some documentation of gn check --check-generated
fd1532f2 [docs] Fix Markdown format missing `
74657a61 Add gn check --check-generated to check dependencies of generated files
6b943827 Fixed typo (missing parenthesis) in get_path_info documentation
d062e74f Improve config documentation.
e15f243a gen.py: Pass -pthread, not -lpthread, in ldflags.
013513c9 gn recipe: Do not pass libraries in LDFLAGS in the Linux recipe
1152229e gen.py: Pass -pthread via ldflags, not libs
01237e9c Remove references to ARM-optimized math implementation
0ac93dd2 For proper order put -lpthreads as a 'library' not a 'linker flag'
1ab6fa2c Attempt to unbreak build with MSVC 15.8.4
082fbe39 Pass -lpthread when linking instead of -pthread
d69a9c37 [help] Fixing help issues.
04685d69 Add --dump-json-tree option for format subcommand.
57586fdb Suppress warning on VS2017.
4dcd2776 Port to FreeBSD.
5519dc2f Reintroduce the ICF flag, turn it on for bots
53107bfc [infra] Update XCode version
377ad041 Enable LTO for release builds
282a428c Disable ICF on Darwin, make it default for Release
71b537ce [format] Extend `gn format` to take a list of files.
b5a2ac6e Improve help output.
d837047a format: Ensure that formatting always reaches a fixedpoint in one run
8ed01d3b Docs: regenerate docs
d84a862e More efficient Value implementation.
bcfb6471 cleanup label_ptr.h
88bd8a8d build/gen.py: Add --no-strip option.
894143c3 format: Fix incorrect dewrap of `if`
45314e29 [metadata] Return metadata in postorder.
e49432fa [metadata] Actually collect the metadata
c1780c21 [metadata] Allow specification of rebase dir
5a9e0a2c [metadata] Adding metadata vars to write_data target
d021d391 [metadata] Add generated_file target type
27b66b57 Allow whitespace in include directives.
c6841d31 Fix a crash on invalid on `not_needed(scope)` without a 2nd argument.
54be6f11 Allow NOSORT to be the last line in a comment in addition to the first.
a07831bb [metadata] Adding `meta` command
0587778f [metadata] Walk function
96c77296 [metadata] Add metadata walk to target
a27e8dc0 [metadata] Adding basic metadata walking
2000587b [metadata] Adding metadata output to gn desc
0e1b8843 [metadata] Adding metadata variable to target
ecc95221 Add links to the "Using GN build" presentation.
13ac6ca4 Test that not_needed works with forward_variables_from

Bug: chromium:947907,gn:64
Change-Id: I896761d7efd06284d3fdd721ccd4f919c413bb3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1551721
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#647541}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: db4e0261d7a533d12aa10ae587ef40a8ec6f992d
diff --git a/DEPS b/DEPS
index 9d87f0e..109d7a2 100644
--- a/DEPS
+++ b/DEPS
@@ -14,7 +14,7 @@
   #
 
   # GN CIPD package version.
-  'gn_version': 'git_revision:0790d3043387c762a6bacb1ae0a9ebe883188ab2',
+  'gn_version': 'git_revision:64b846c96daeb3eaf08e26d8a84d8451c6cb712b',
 
   # When changing these, also update the svn revisions in deps_revisions.gni
   'clang_format_revision': '96636aa0e9f047f17447f2d45a094d0b59ed7917',