Move gn _run target generation into test().

TBR=brettw@chromium.org
BUG=
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1653003006

Cr-Original-Commit-Position: refs/heads/master@{#373232}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6b1b03783b81ea27bb521c02aa84b74f06d6f71a
1 file changed
tree: 5e01e3503ad161ccdcc0c2d207994c652b2054e7
  1. tools/