Get ViaDDL working with Vulkan

Change-Id: Iab5ab689529227d2c8a6dbea89e555b73622a99c
Reviewed-on: https://skia-review.googlesource.com/118989
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed