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Add implementation to chrome://.

Add implementation to chrome-untrusted://.

Add tests.

Bug: b:162051831
Change-Id: I79b6010eb70f4209261273ea37d2069ce1b72195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418674
Commit-Queue: Laurențiu Olteanu <lolteanu@google.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Mahmoud Gawad <mgawad@google.com>
Cr-Commit-Position: refs/heads/master@{#811153}