Add WGSL support for array constructors.

The existing constructor code worked as-is for array construction;
it just needed to be called.

Bug: skia:14082
Change-Id: I4a023fb5fc77ca97d6050e33e041a39309d58cad
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/705221
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
9 files changed