Add gtest parameter pretty printer for TrustStoreMacImplTest

Fixed: 1357788
Change-Id: I80a33d894a2260f2dab702284706202376d79558
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3863483


Reviewed-by: Hubert Chao <hchao@chromium.org>
Commit-Queue: Matt Mueller <mattm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1040973}