tree 047ef31fe8682453d9b8482469a5fdb61dce37bd
parent fddb682db22912b309162e9ab27a1162c6c32f74
author Cassie Wang <cassiewang@google.com> 1611256429 -0800
committer Cassie Wang <cassiewang@google.com> 1611891930 -0800

Make ImplInstanceManager a singleton

This moves the whole class into a singleton style for consistency.

Bug: 178730366
Test: presubmit
Change-Id: Idbba534fa81e80fcd865ebc056dd8d24a301e691