This reverts commit 84d6cf9b5b.
Reason for revert: Blocking Chrome roll
Original change's description:
> Removed SkSL SymbolTable aliases
>
> Now that we have first class Type aliases, we no longer need this
> obsolete SymbolTable mechanism.
>
> Change-Id: Ibfb21ed153d1cbca59679659254e4d58d18f5c7c
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/491441
> Reviewed-by: John Stiles <johnstiles@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Change-Id: Ie4aadf49d83af2ad4a4e09061e92d27a4610d8fe
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/491696
Auto-Submit: Robert Phillips <robertphillips@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
f5853ff652