add create ddl fuzzer

This is an attempt to fuzz the usage of SkSurfaceCharacterization,
SkDeferredDisplayRecorder, and SkDeferredDisplayList.

This fuzzer first makes a surface and characterization from
GrDirectContext and then create a DDL and draw it on the surface.

The code is compiled with ninja and run with AFL at the speed around
600/sec

The future changes will include:
1. An alternative way to create DDL: first create the surface and
extract the characterization from that existing surface.

2.currently we just pass the ownership of the DDL into draw_ddl. In
the future we should add a version that retains ownership of the DDL
in order to fuzz the lifetime of the DDL.

3. Refactorize line 62-119

Change-Id: I9cd9736813be3abc82430bd4eeb559d6993ecbd4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/303600
Commit-Queue: Zepeng Hu <zepenghu@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
4 files changed