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Add a tall html document for scrolling tests. No change in behavior so
no new tests, just adding a resource.

Bug: 891150
Change-Id: I8069e481c098aae21564e5e3ba43e52b12372a04
Reviewed-on: https://chromium-review.googlesource.com/1256463Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595729}