Can be used to help with deprecation during simple struct renames.
Includes typedefs for VertexAttributeDescriptor -> VertexAttribute and
VertexBufferLayoutDescriptor -> VertexBufferLayout as specified by the
latest RenderPipelineDescriptor changes.
Bug: dawn:642
Change-Id: Iab3d74d179884499540e813b0e66859713031ccb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/40581
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>