Filter taps which are near in time but far apart.

BUG=chromium-os:38740
TEST=Close proximity taps which are far apart are canceled.

Change-Id: Iaecb70e30c43041a24243ee0d228cd949097d2a1
Reviewed-on: https://gerrit.chromium.org/gerrit/42885
Commit-Queue: Robert Flack <flackr@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Tested-by: Robert Flack <flackr@chromium.org>
4 files changed