Revert "Revert "Revert "Revert "Make threaded proxy generation MDB-friendly, and defer instantiation""""

This reverts commit 9f8d4d36b514ffe3cc3a4a48900e3dc1fecb2a96.

Bug: skia:
Change-Id: I8d7c1df24d8b13b94404f3d9ba69a1ab55ee00c0
Reviewed-on: https://skia-review.googlesource.com/52920
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
12 files changed