Update ripple according to UX feedback.

1. Consistent enter and exit duration and speed. Both bounded and
unbouned. It used to be that exit is much faster than enter.

2. Instead of starting from 0 size radius, we start from some size
according to the current drawable's bound.

b/63635160
Test: demo app, settings app and calculator app

Change-Id: I1135fefc9d9103f170ab889269b38a9900835450