Re-land "Perform Vulkan resets in a background thread"

Bug: skia:
Change-Id: I1c7ec365a370137ca64d9091cb60e6430c3f1c28
Reviewed-on: https://skia-review.googlesource.com/c/177069
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index 915e06f..81ac5a2 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -584,6 +584,8 @@
   "$_src/gpu/vk/GrVkCaps.h",
   "$_src/gpu/vk/GrVkCommandBuffer.cpp",
   "$_src/gpu/vk/GrVkCommandBuffer.h",
+  "$_src/gpu/vk/GrVkCommandPool.cpp",
+  "$_src/gpu/vk/GrVkCommandPool.h",
   "$_src/gpu/vk/GrVkCopyManager.cpp",
   "$_src/gpu/vk/GrVkCopyManager.h",
   "$_src/gpu/vk/GrVkCopyPipeline.cpp",