Fix caching of HLSL in D3D backend

We were always tagging the stored shaders as SkSL, so they (naturally)
didn't compile when we loaded them.

Change-Id: I96062808751b6233c9e90b29150f66270d0dd198
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/296836
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
1 file changed