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Added BUILD target for mock_actions_model.js that is testonly.

Bug: 860355
Change-Id: Idb81f1e2bdcbda7ba4164b502e4b81f551f2b0bb
Reviewed-on: https://chromium-review.googlesource.com/c/1292660
Commit-Queue: Stuart Langley <slangley@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601485}