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1. Since we want to turn on viz hit-test both with and without viz
display compositor, changing RenderWidgetHostInputEventRouter to use
use-viz-hit-test flag instead.

2. Add use-viz-hit-test flag to viz-component switches.

Bug: 804888
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I65e268d826cc57e289d1579291066cc8c58f6203
Reviewed-on: https://chromium-review.googlesource.com/879843
Commit-Queue: Ria Jiang <riajiang@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531380}