Ruby: Add a test for modern Japanese fonts

web_tests depends on third_party/test_fonts since this CL.
This CL has no behavior changes in production.

Bug: 1082087
Change-Id: Ibe1dde711426c7b0f0ed2dad4b2435e820648dd1
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng_disabled
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249272
Reviewed-by: Takuto Ikuta <[email protected]>
Reviewed-by: Koji Ishii <[email protected]>
Reviewed-by: Yoshifumi Inoue <[email protected]>
Commit-Queue: Kent Tamura <[email protected]>
Cr-Commit-Position: refs/heads/master@{#779755}
diff --git a/BUILD.gn b/BUILD.gn
index 870dd7a..206b8b5 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1109,6 +1109,7 @@
       "//third_party/blink/web_tests/resources/",
       "//third_party/blink/web_tests/wpt_internal/",
       "//third_party/pywebsocket3/src/mod_pywebsocket/",
+      "//third_party/test_fonts/test_fonts/",
 
       # Needed by run_web_tests.py to detect DCHECK build.
       "$root_out_dir/args.gn",