Reland "Revert "serialize fonts instead of paints""

This reverts commit 9803b8f1d1979ad615e97ee1fa26dfa3381440fd.

Reason for revert: break cc/paint/oop_pixeltest.cc ?

Original change's description:
> Revert "Revert "serialize fonts instead of paints""
> 
> This reverts commit 576633cf57cf05761f950ac503cec01b03b1e75b.
> 
> Fix: add new version to both variants of SkReadBuffer
> 
> Bug: skia:
> Change-Id: I8ba60d374860718402328398a4a09b8c97d65e33
> Reviewed-on: https://skia-review.googlesource.com/c/179845
> Commit-Queue: Mike Reed <reed@google.com>
> Auto-Submit: Mike Reed <reed@google.com>
> Reviewed-by: Mike Reed <reed@google.com>

TBR=reed@google.com

Change-Id: Ic20b22ae305f9b22863f6f441d45457c4e565f66
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/179882
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
7 files changed