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We plan to share the snap fling logic between cc and blink. But with the
dependency restrictions, we can only put the shared logic under cc/.
This patch moves the logic from ui/ to cc/, in preparation for blink to
use the same logic to make snap fling works there.

As cc/ doesn't accept blink::WebGestureEvent and blink::WebInputEvent,
we create GestureScrollType and GestureScrollUpdateInfo to pass in the
necessary messages.

Bug: 778259
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I0df8cf1002d51646404310ca50eb00a536e0b5d1
Reviewed-on: https://chromium-review.googlesource.com/1024198Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Commit-Queue: Sandra Sun <sunyunjia@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559533}