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Before this CL, target_element in UiInputManager would also be the input
caputring element. In this CL, the target_element is always the element behind
the ray. This makes the code easier to read and simplifies hover events.

The only functional change in this CL is that we send hover events to non-input
caputring elements. For example, if we have element 1 and element 2, clicking on
element 1 and moving to element 2 will send HoverLeave to element 1 and
HoverEnter to element 2.

This CL also removed the unused ButtonState::CLICKED

Bug: 
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: I1be4a8f3cf593e6341df0540efcfd0bc5456f217
Reviewed-on: https://chromium-review.googlesource.com/830886Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524489}