Don't show the background when pressed and focus

According to the spec, the foreground will cover the whole area at
the end of expansion, and do not show the background.

In bounded case, the ripple exit should start from the current value.

b/63635160

Test: demo app, calculator and settings
Change-Id: I64d8b941e2b28ea11165d29de3e6ef77d5ee78f5