Initialize more fields in VulkanBackendContext.

~VkTestHelper assumes that these fields will be initialized to
VK_NULL_HANDLE if they are never set up:
https://source.chromium.org/chromium/chromium/src/+/main:third_party/skia/tools/gpu/vk/VkTestHelper.cpp;l=252,257,261;drc=bd662d15f80b6544293b08d6a3a30188d2147189

Change-Id: Id46666fa7681e3eeb9b70807dea6b3c667522ba3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/842116
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
1 file changed