Move Vulkan DebugCallback code into tools.

Bug: skia:
Change-Id: Ib356200e86e54f9ff0ba16396874e6fd10cf0465
Reviewed-on: https://skia-review.googlesource.com/137424
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
8 files changed