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This cl sends a GFS with zero velocity in |OnAutoscrollStart| to make sure
that the GFC sent in |onAutoscrollEnd| doesn't get filtered. Processing the
GFC will generate a GSE with ends the current scroll sequence.

Bug: 829794
Test: WheelScrollingWorksAfterAutoscrollCancel
Change-Id: I929e473018f3de9ecf8fafb1f7b2e8e6a9adfd2f
Reviewed-on: https://chromium-review.googlesource.com/1026454
Commit-Queue: Sahel Sharifymoghaddam <sahel@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Sahel Sharifymoghaddam <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555217}