It is safe to store raw pointers to these objects since they are both
always accessed on the same thread we can safely invalidate their
back pointers when needed. This allows us to remove a ref of Recorder on
Device.
Bug: skia:12794
Change-Id: Icb5e079f7e820824520d52e48012b447e714a9ee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/494239
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
