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Since we are not updating hover during mouse wheel scroll, we should
update hover when we handle the GestureScrollEnd event on compositor or
main thread.

Bug: 877132
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I732aea455db927ff5ad44b89e7a446917ad94e35
Reviewed-on: https://chromium-review.googlesource.com/c/1265555Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605873}