[Trusted Types] Add use counters for trusted type use.

Bug: 739170
Change-Id: I845f94ff98f3a726ccd7727e928030f325601a08
Reviewed-on: https://chromium-review.googlesource.com/c/1373818
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620298}
5 files changed