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For testing purpose, we want to add a new action to GpuBenchmarking to
simulate the touchpad swipe action, which is a mouse wheel scrolling
and a fling.

Now the GestureSourceType of MOUSE_INPUT and TOUCHPAD_INPUT are treated
the same, but I will have another CL to separate them.

Bug: 864001
Change-Id: I736831d50e1d0adf945ae22b6b045a12ee0ae95c
Reviewed-on: https://chromium-review.googlesource.com/1161184Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584272}