Update shortcut animations.

- Open animation: shortcuts reveal using modified circular reveal
  (so that it reveals in the pill shape instead of a circle);
  slight translation away from the original icon; scale icon and text.
- Hover animation: scale the shortcut pill and translate others away.

Bug: 28980830
Bug: 30127368
Change-Id: I8ed05c7a082f2c2a3f6c663da7259f6cd33e394f