Revert "serialize fonts instead of paints"

This reverts commit f1ae66bedd8521ecc865b439ce35a89c657ad3f4.

Reason for revert: need to guard for no-serialization builds (I think)

Original change's description:
> serialize fonts instead of paints
> 
> Some changes from before:
> - we don't force serializing a typeface if the field is null
> - we don't serialize the blob bounds (don't trust them)
> 
> Bug: skia:
> Change-Id: I41281b2aa63a1026de87330023346f1da5378c1f
> Reviewed-on: https://skia-review.googlesource.com/c/179735
> Commit-Queue: Mike Reed <reed@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Reviewed-by: Herb Derby <herb@google.com>

TBR=bungeman@google.com,herb@google.com,fmalita@chromium.org,reed@google.com

Change-Id: Id891198bc683b9b5e7417a30c2f7adb0bd978e30
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/179843
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
7 files changed