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This patch takes scrolled offset into account when hit testing the
children of a scroll container, so that scrolled contents can be hit
tested correctly.

Bug: 855279
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: Ic84b40c06302c457cf32cacaa5e79f419dcc3a2b
Reviewed-on: https://chromium-review.googlesource.com/1125312Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572398}