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The CL dumps gesture property values for touch devices that run
with the CrOS gesture library. The format is designed to be
backward-compatible with the X11 behaviour.

Contributed by sheckylin@chromium.org

BUG=450159
TEST=samus ChromeOS build

Review URL: https://codereview.chromium.org/864253002

Cr-Commit-Position: refs/heads/master@{#313446}