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We kept |touch_scrolling_| simply to be able to set the
|is_direct_manipulation_| bit on the scroll state in ScrollBy. It's
cleaner to simply have InputHandlerProxy set this bit correctly in all
cases.

The majority of this CL is simply adding an extra parameter to the state
creation method in unit tests so that we can set the bit correctly there
too. This was a mechanical change.

Bug: 1016229
Change-Id: If0c46d283fb030f205ffd39cdb0c04dd9e1bd7a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1981335
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728517}