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The introduced new class is meant to replace the current fake objects
used in various browser tests.

BUG=b:158955123

Change-Id: I743bd605321e7f384eb22a9ecac4fb40ae93e980
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2297062
Commit-Queue: Leo Lai <cylai@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789383}