Manage ppapi plugins on a per-origin basis.

Expands the management of plugins to consider origin when assigning
a process. Only passes empty origins at present, so no observable
change expected.

Bug: 809614
Change-Id: I129495ddc94c86dc1c4aa1b3a7942354eabe59d4
Reviewed-on: https://chromium-review.googlesource.com/915182
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Ehsan Karamad <ekaramad@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540294}
14 files changed