Revert "Remove isMipMapped from GrSurfaceDesc" and follow up find exact scratch CL

This reverts commit 52cb5fe23b8f960bb3248620c8f4e2f2957b6685.
This reverts commit e1fbf170580a4b932d0abcb11593fb1ef0cac60b.

TBR:bsalomon@googole.com

Bug: chromium:763333
Change-Id: Ie94e00c3c7231e32f009b9dc7bb51ebb53baf7b1
Reviewed-on: https://skia-review.googlesource.com/44400
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
12 files changed