Add a flag for rounded box charging ripple.

DockingAnimationCallback passes `rippleShape` in ag/19518997 (separating the CLs because they are in a different module.)

rounded box ripple: https://recall.googleplex.com/projects/5caa6343-713d-48a6-9354-df13859d3244/sessions/eaf63912-b4d2-4590-8af3-9748646e2b4d

Bug: b/237282686
Test: Manual
Change-Id: I074e1459893b31a6ff23c416eb710bc62bc67a87