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This CL refactors all user-interaction logic from CRWWebController into
UserInteractionEvent and UserInteractionState.

Bug: 956511
Change-Id: I1ae63c395c0b269a30ab0b7b2743103c1ae4ffbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610775
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660322}