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This cl adds new metrics for GSU events that are generated from a
touchscreen fling progress. We want to keep the latency of these GSUs
separate from GSU events generated from touch move events since the
latency for handling the GSU events from fling doesn't include the time
needed for handling a touch event.

Bug: 249063
Test: RenderWidgetHostLatencyTrackerTest.TestInertialToScrollHistograms
Change-Id: Iba4664d19e5218cae4886ee543b709d4c2152fa4
Reviewed-on: https://chromium-review.googlesource.com/1062806Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Sahel Sharifymoghaddam <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561525}