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This CL has no functional change. It modifies UiElement::Hittest to take a ray
as input in preperation for keyboard UI element support.

Bug: 780135
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I2788ec50ad1b23aea48489e6c6e7034775fc83e6
Reviewed-on: https://chromium-review.googlesource.com/767507Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516321}