Revert "Revert of Use the GrCacheable ID to eliminate the need for notifications to GrGpuGL when textures and RTs areā€¦ (https://codereview.chromium.org/376703009/)"

This reverts commit 249171e7d29b5559f3eefe9dbd437030bfad3fda.

Uses 32 bit id instead of 64. Renamed instanceID to uniqueID to match existing code.

R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/414493002
9 files changed