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Unlike touchscreen pinch events, touchpad pinch events don't occur
within a gesture scroll sequence. If a touchpad pinch update couldn't
be directly coalesced with a previous pinch update, we now just enqueue
the pinch update rather than producing a scroll update.

We also now allow for pinch updates to be coalesced if their anchors are
approximately equal to accommodate OOPIF coordinate conversion
imprecision.

Bug: 897791
Change-Id: I3331fc5761b5ca11d4b05386e5ab4468ac2291d7
Reviewed-on: https://chromium-review.googlesource.com/c/1349851Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613245}