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Only implemented for extensions for now.
Will be used in subsequent CL.

Bug: 989792
Change-Id: I9d15f7c007ecdf655c060d858122a7b3b3ed768a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783679
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692987}