Render VectorDrawables in software and then upload to the VDAtlas.

For frames with multiple VDs the context switching involved was causing
worst case frame times of ~40ms to draw all VDs in the frame whereas
this new approach has worst case performance of ~5ms when drawing the
same frame (w/ approximately 26 VDs).

Bug: 64487466
Test: SystemUiJankTests#testGoToFullShade
Change-Id: I5cad0b5df86e5eac3722ee8695fc7511b38b8a7c