Add support for splat-constructors.

Change-Id: I999dbb360c9f8cb54c78b607dc62f16266213317
Bug: skia:13676
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/609598
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
5 files changed