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Re-land #2 includes update to licenses.py and removes stale files.

Re-land includes missing headers directory.

This replaces several grouped dependencies with one meta-repo.
The meta-repo will allow us to group multiple inter-dependent
deps rolls into one single roll. This solves the problem of
separate rollers breaking because of the inter-dependencies.
It also allows ANGLE and Chrome to share common bits like the
README and .gitignore files.

Bug: angleproject:5390
Bug: 1153258
Change-Id: Ie425e232096a25711dd90e84a6d91bf3324903ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595457
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Auto-Submit: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838196}