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CL:1924341 limited the horizontal scroll of the directorytree to 0, to
resolve issue 1025581, and needs a test of this behavior.

Test: create a nested set of test folders, and use keyboard arrow-left
(provided by expandSelectedFolderInTree, note) to navigate to the last
of those folders. Post navigation, verify the navigation, and that the
directory tree is not horizontally scrolled.

This new test passes with CL:1924341, and fails before that CL (good).
The CL used requestAnimationFrame (rAF) to limit the scroll. Add async
test rAF helper and call it to ensure the scroll rAF is done, and that
expandSelectedFolderInTree events have been processed.

Test: browser_tests --gtest_filter="*TreeKeyboardHorizontalScroll*"
Bug: 1025581
Change-Id: Iff79b963559d282841f1d2045aadcee7e5840cea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1936579Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719411}