Update Vulkan skia creation to use apiVersion instead of instanceVersion

This updates to use Skia's new api which takes the vulkan apiVersion
instead of the instance version. This is technically more correct since
the application apiVersion is really the only client modifiable version
value in vulkan.

This change also updates the webview structs to use the apiVersion as
well.

Test: manual build and testing.
Change-Id: I6ce7c20949eb7242f7bbe69955b54c0785696891