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At touch sequence start, the white listed touch action may not have value
under certain corner cases, which is similar to the case when a touch
start is ack from the main thread (that the main thread touch action
may not have value). In this case, we explicitly set the white listed
touch action to Auto.

Unit tests are added to ensure correctness.

Bug: 904648
Change-Id: I9140f1f0625ab9b4f8c30765cd10324605b8db40
Reviewed-on: https://chromium-review.googlesource.com/c/1454089
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630015}