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Change the root PRESUBMIT_test_mocks.py as well to include the new API.
A compatibility layer is added to support the old API for now, and
should be removed when the old API is removed.

Fixed: 1108326
Bug: 1098560
Change-Id: I562686f265779cbdaf33134fd4d5af4bdcae6e0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314196
Commit-Queue: Robert Ma <robertma@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Robert Ma <robertma@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790926}