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All policy-based extensions' files should be checked in some way. It
already works for Chrome Web Store extension, but not yet for
self-hosted ones. This commit adds a way of telling to ContentVerifier
that extension should be checked.

The commit only adds a new delegate method, which is not yet used.

Bug: 958794
Change-Id: I67898ce61c47d9ecc53c0398bfa5e9bdb65373b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1710327Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Nikita Podguzov <nikitapodguzov@google.com>
Commit-Queue: Oleg Davydov <burunduk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683213}