I'm unable to reproduce the issue with the gn args of the bot at the revision where it failed.  Do you have repro steps?

I can reproduce like below. Second ninja invocation for test_fonts/.uuid should be no-op.

tikuta@tikuta:~/chromium/src$ cat out/ChromiumOS_ASAN_Release/args.gn
enable_ipc_fuzzer = true
is_asan = true
is_component_build = false
is_debug = false
is_lsan = true
sanitizer_coverage_flags = "trace-pc-guard"
strip_absolute_paths_from_debug_symbols = true
target_os = "chromeos"
use_goma = true
v8_enable_verify_heap = true
# goma_dir = "/b/swarming/w/ir/cache/goma/client"
tikuta@tikuta:~/chromium/src$ ninja -C out/ChromiumOS_ASAN_Release/ test_fonts/.uuid
ninja: Entering directory `out/ChromiumOS_ASAN_Release/'
[1/1] Regenerating ninja files
[799/799] ACTION //base/test:do_generate_fontconfig_caches(//build/toolchain/linux:clang_x64)
tikuta@tikuta:~/chromium/src$ ninja -C out/ChromiumOS_ASAN_Release/ test_fonts/.uuid
ninja: Entering directory `out/ChromiumOS_ASAN_Release/'
[1/1] ACTION //base/test:do_generate_fontconfig_caches(//build/toolchain/linux:clang_x64)

thanks, I'm able to repro now and I think this is just a dependency issue.  I'll upload a fix soon

(I wasn't able to repro before because I was building the do_generate_fontconfig_caches target which has all the necessary dependencies)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dcc0fd9fc4cdcb05eb07a2efd2f083c88f1e31c6

commit dcc0fd9fc4cdcb05eb07a2efd2f083c88f1e31c6
Author: Tom Anderson <thomasanderson@chromium.org>
Date: Fri Jan 11 19:54:39 2019

Fix dependency issue when building test_fonts/.uuid

The copied test fonts are inputs to generate_fontconfig_caches, so must be
listed in deps, not data_deps ( https://crbug.com/919422 ).

generate_fontconfig_caches creates test_fonts/.uuid, but fontconfig deletes
.uuid when there are no fonts [1], so if generate_fontconfig_caches runs before
test_fonts are copied, .uuid will be deleted and the build will be dirty (and
the cache file will be incorrect).

[1] https://cs.chromium.org/chromium/src/third_party/fontconfig/src/src/fcdir.c?rcl=ba206df9b9a7ca300265f650842c1459ff7c634a&l=429

BUG= 919422 
R=thakis
CC=erikchen,tikuta

Change-Id: I94057b8035510a122e379249f9f8c60c9e526a57
Reviewed-on: https://chromium-review.googlesource.com/c/1406228
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622108}
[modify] https://crrev.com/dcc0fd9fc4cdcb05eb07a2efd2f083c88f1e31c6/base/test/BUILD.gn

Thanks!