Add GN rules for building instrumented libraries.

BUG=585127

Review-Url: https://codereview.chromium.org/2103683002
Cr-Original-Commit-Position: refs/heads/master@{#406452}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: fba9bdbfc9ccc9c7909e1bd4784bcb05df9da649
3 files changed