Populate ALL copies of a command line flag during parsing

Now that we're declaring flags statically per-tool, we were only
setting the value on one of them (randomly) in the linked list.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3881

Change-Id: I448cb7f42ee01a16daa65986b14aee9f1a2a3588
Reviewed-on: https://skia-review.googlesource.com/3881
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed