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We are going to implement wheel event handler region computation in
ScrollingCoordinator and painting, since wheel event regions share many
similarities to touch action rects, we want to use the same code path
for wheel events. As a result, TouchActionRect will store wheel data as
well and they should be renamed to HitTestRect.

Bug: 841364
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1d9c967033846d1945163192a437f11cbebdf641
Reviewed-on: https://chromium-review.googlesource.com/1239490Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianda Sun <sunxd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595330}