Pie controls: Tweaking UX for pie service (1/2)

With the introduction of pie service there is the need to
fine tune the parameters for activation again.

Patch Set #2:
* Base trigger thickness set to 10dp
* User settable activation sensitivity

Patch Set #4:
* Reverted #setSensitivity() in PieGestureTracker
* Added Sensitivity "Very High"

Signed-off-by: Paul Beeler <sparksco@gmail.com>
Don't include flags in configuration change if their value hasn't changed.

This makes the check in updateFrom() match the logic in diff().

Change-Id: I3ab4e8460f7fbf985ef55b9514a8aa90d401d486
Revert "Increase pie trigger time to 340, currently we have to swype too fast to get a trigger"

This reverts commit 5f0aaf337e66278e03987b9f7940259f44dacb17.