Add UniformManager tests for mixed 16/32-bit scalar/vector packing.

Thankfully, this was already working; no changes in the uniform manager
were needed.

Change-Id: Ic2c4807e8efa63a05127d6f96d8a58ce785bbc1e
Bug: skia:13478
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/556316
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
1 file changed