Add GrVkCopyPipeline to handle vulkan copies as draws

src/gpu/vk/GrVkMemory.cpp

Index: src/gpu/vk/GrVkMemory.cpp
diff --git a/src/gpu/vk/GrVkMemory.cpp b/src/gpu/vk/GrVkMemory.cpp
index 98b2f89e243a0964228fd54f3fba9e0f51b6b0cc..ae954d3934d874122a96986602424d08ad21576c 100644
--- a/src/gpu/vk/GrVkMemory.cpp
+++ b/src/gpu/vk/GrVkMemory.cpp
@@ -214,7 +214,7 @@ VkPipelineStageFlags GrVkMemory::LayoutToPipelineStageFlags(const VkImageLayout
                VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL == layout ||
                VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL == layout ||
                VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL == layout) {
-        return VK_PIPELINE_STAGE_ALL_COMMANDS_BIT;
+        return VK_PIPELINE_STAGE_ALL_GRAPHICS_BIT;
     } else if (VK_IMAGE_LAYOUT_PREINITIALIZED == layout) {
         return VK_PIPELINE_STAGE_HOST_BIT;
     }