Add tracking of unique proxyID beside unique renderTargetID in auditTrail and clearOp

Split out of: https://skia-review.googlesource.com/c/10284/ (Omnibus: Remove GrSurface-derived classes from ops)

Change-Id: I5845a47d94decc455ec3b1f0a5876b1c82aa32e8
Reviewed-on: https://skia-review.googlesource.com/10750
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
12 files changed