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When the kCompositorTouchAction flag is enabled, and browser receives
the touch start ack from the compositor, if there is no white listed
touch action, then the touch start must be non-blocking, thus setting
the touch action to Auto.

Unit tests are modified to account for this change.

Bug: 907959
Change-Id: Ife589533a959ccce1376926e14935639341f32ea
Reviewed-on: https://chromium-review.googlesource.com/c/1349673Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611092}