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Convert string from mojo handle.

Create build target for mojo_utils.

Change tests.

Bug: b:162051831
Change-Id: I60017604fde2c55ca34165af3c5d10e16760ee8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352908Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mahmoud Gawad <mgawad@google.com>
Reviewed-by: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Laurențiu Olteanu <lolteanu@google.com>
Cr-Commit-Position: refs/heads/master@{#799638}