Support design - fix FloatingActionButton elevation

This bug has been fixed in the framework for api 25+ but
a between 21-24 still triggers a NPE when an animation has
a delay set (via "setDelay" or "after"). The current
workaround is introducing a no-op animation which mimics
the delay on the following one by having a duration.

Bug: 32136707
Test: ./gradlew support-design:connectedCheck --info \
      --daemon -Pandroid.testInstrumentationRunnerArg\
      uments.class=android.support.design.widget.Float\
      ingActionButtonTest

Change-Id: I75722d6e142c0d75170ef912b261c1d7a9b55a1e
3 files changed