Add EventLatency metrics for gesture-pinch events Gesture-pinch events can have two different input modalities: Touchscreen and Touchpad. This CL adds both UMA and UKM metrics for pinch events. The UKM collection request has been approved here: https://docs.google.com/document/d/1SDxdua997Gm7ihJFVjinHz9qTdBzTJrEzC7GEeQHs-8/edit# Bug: 1075725 Change-Id: Ia6ae0096b44cdcc091d08a256e6c2425b47b86ae Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212788 Reviewed-by: Ken Buchanan <kenrb@chromium.org> Reviewed-by: Ilya Sherman <isherman@chromium.org> Reviewed-by: Jonathan Ross <jonross@chromium.org> Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org> Commit-Queue: Mohsen Izadi <mohsen@chromium.org> Cr-Commit-Position: refs/heads/master@{#855819}
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