[Contextual Search] Exclude suppressed taps from aggregate suppression heuristics logging
We would like the aggregate suppression heuristic logging to determine
the impact of signals we are collecting but not yet using to suppress.
Also changes BarOverlapTapSuppression to only consider the y-position
of the tap.
BUG=
642897,
642962
Committed:
https://crrev.com/e233f01811cda4d7e9e5f9d3cd5bd536492e5003
Cr-Commit-Position: refs/heads/master@{#420736}