Move and rename KeyboardView.computeProximityThreshold to
KeyDetector.getMostCommonKeyWidth. And make it public for unit test
use.
This is a part of multi-project change (If751659a, Idb18f362)
Bug: 3414081
Change-Id: If751659a53c7412f836d6d28866760ffe84b179b
This change introduces new package com.android.inputmethod.keyboard
which hosts keyboard related classes.
Also adds missing @Override and @SuppressWarning("unused") annotation
Change-Id: I0317f5cfa317e13f3c77815f48ffc69b5d1ade05