Add validation to reading kRec_SkDescriptorTags

Bug: chromium:940284, chromium:940843
Change-Id: Id6ce237781c6515f52341d3e56614e13e8ba76d6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/200045
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Adrienne Walker <enne@chromium.org>
Reviewed-by: Khushal Sagar <khushalsagar@chromium.org>
Reviewed-by: Mike Klein <mtklein@google.com>
5 files changed