message: Fix the barrier in vulkan::Texture::TransitionUsageNow to make the
  barrier cover all the slices in a 2D array texture.
diff: @@ -333,7 +333,7 @@ namespace dawn_native { namespace vulkan {
  barrier.subresourceRange.baseMipLevel = 0;
  barrier.subresourceRange.levelCount = GetNumMipLevels();
  barrier.subresourceRange.baseArrayLayer = 0;
  - barrier.subresourceRange.layerCount = 1;
  + barrier.subresourceRange.layerCount = GetArrayLayers();
  ToBackend(GetDevice())
  ->fn.CmdPipelineBarrier(commands, srcStages, dstStages, 0, 0, nullptr, 0, nullptr, 1,
  