Revert "Remove unused fields from GrTextBlobKey"

This reverts commit 51b99659ed826c5009f9f261a17cf36a61c4702a.

Reason for revert: These are important for the key.

Original change's description:
> Remove unused fields from GrTextBlobKey
> 
> Change-Id: Ibb42f943ffbed16867d714e9a1eee35d3f422b2a
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259282
> Commit-Queue: Herb Derby <herb@google.com>
> Auto-Submit: Herb Derby <herb@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,herb@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: If34b4637136135d5d8a7b66c5b5ff1a24bd214c3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259807
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
4 files changed