Pass the old/new VkImageLayouts to Vulkan image import/export

Returning the layouts from an export operation and then using
them in a subsequent import operation allows the import to preserve
the texture contents.

This fixes Vukan image wrapping on some AMD/NVIDIA devices.

Bug: dawn:200
Change-Id: Icbb6e759856d410bb69724b9f439bc3088756d19
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28380
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>

src/dawn_native/DawnNative.cpp

@@ -195,8 +195,14 @@ namespace dawn_native {
         return GetProcMapNamesForTestingInternal();
     }
 
-    ExternalImageDescriptor::ExternalImageDescriptor(ExternalImageDescriptorType type)
-        : type(type) {
+    // ExternalImageDescriptor
+
+    ExternalImageDescriptor::ExternalImageDescriptor(ExternalImageType type) : type(type) {
+    }
+
+    // ExternalImageExportInfo
+
+    ExternalImageExportInfo::ExternalImageExportInfo(ExternalImageType type) : type(type) {
     }
 
 }  // namespace dawn_native