Instrumented libraries: the much-needed build script rewrite.

Cleaner, no longer relying on pwd, and with 100% more OOP.

BUG=none
R=glider@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1003593002

Cr-Original-Commit-Position: refs/heads/master@{#320293}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a67c91a9d38e9054914c09b7bcd5c290e18645ec
3 files changed