Ignored inertial scroll (fling) event should ignore in ReceivedEventACK()

An inertial scroll (fling) event from previous completed overscroll
gesture sequence should not modify scroll state in ReceivedEventACK().

Bug: 647140
Change-Id: I48c595124c7f0e2e37b92d256ab13dc50a1ec400
Reviewed-on: https://chromium-review.googlesource.com/1003214
Commit-Queue: Jianpeng Chao <chaopeng@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549586}
3 files changed