Update expanded view "drag to dismiss" animation

Updates the scale amount and animation duration based on motion spec.

Adds new animation for updating rounded corners while expanded view is
being dragged.

Bug: 283991264
Test: manual, open a bubble with bubble bar, drag it to dismiss target
Change-Id: Ic8821c8f6be91691d33532f8b0b3d1cab4d5c213
4 files changed