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This CL adds a basic test that the infobar container responds to
scrolling as expected in WebLayer. To enable this test we also made the
following changes:

- Factored out some support for setting up scrolling in tests from
  BrowserControlsTest.java for reuse
- Extended EventUtils.java's simulation of dragging to post the
  finger down/move/up events sequentially. This change is necessary to
  get the scroll events to be fully processed within //content and
  ripple out to the infobar container.

Bug: 1093846
Change-Id: Ifb94f33c498a13d711336165029370e259e330c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247894
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780235}