Roll Vulkan-Headers from a6d08c75d219 to 8446db62f194 (4 revisions)
Roll Vulkan-Headers from a6d08c75d219 to 8446db62f194 (4 revisions)

https://chromium.googlesource.com/external/github.com/KhronosGroup/Vulkan-Headers.git/+log/a6d08c75d219..8446db62f194

2020-08-07 lenny@lunarg.com Add a loader features interface
2020-08-07 lenny@lunarg.com Add missing ifdef for extern "C"
2020-08-07 lenny@lunarg.com Update vk_icd.h with proper extern "C" declaration
2020-08-07 lenny@lunarg.com Update vk_icd.h with typedefs and prototypes

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/vulkan-headers-angle-autoroll
Please CC b6fc25fe0362055230985c05cbfa8adb741ccc0f@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Change-Id: Ie6f308d81af5072659064d099e4895e907f31894
Bug: None
Tbr: b6fc25fe0362055230985c05cbfa8adb741ccc0f@google.com
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2345720
Reviewed-by: angle-autoroll <09ea9b8bac6cceb6ec3b72e615745c3a1e982ce2@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <09ea9b8bac6cceb6ec3b72e615745c3a1e982ce2@skia-public.iam.gserviceaccount.com>

ppy/angle,ppy/angle,ppy/angle,ppy/angle