[graphite] Add PrecompileContext::precompile option

This connects all the innards of the Android-style precompilation system.

Bug: b/390186667
Change-Id: I3e37a0f1cf0fbe1cab8d6cc25984631314aa498e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/946057
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
10 files changed