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*   Updates the target drag distance at which the home screen stops
    scaling - instead of extending for a fixed point from the threshold
    at which transition is allowed, that target is set to the center of
    the screen
*   Significantly shortens the timeout to trigger transition
*   Allows transition if pointer is moving, provided that the velocity
    is below certain threshold (instead of requiring pointer to stay
    still)

BUG=1005366, 1025283

Change-Id: Ic322932a3ae519a1989ef343f6f2e960dca29709
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912993
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715844}