skia2/tests/sksl/errors/Ossfuzz38944.glsl

### Compilation failed:

error: 1: expected expression, but found ''
1 error
Fixed DSLParser error uncovered by ossfuzz Missed one more case of Optional<Wrapper<Expression>>. This should be the last one. Bug: oss-fuzz:38944 Change-Id: Ic7f790cd99e2a3ee1c3874cc767a4702265d1723 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/450476 Reviewed-by: John Stiles <johnstiles@google.com> Commit-Queue: Ethan Nicholas <ethannicholas@google.com> 2021-09-20 14:18:58 +00:00			`### Compilation failed:`

			`error: 1: expected expression, but found ''`
Fix for fuzzer-discovered error with invalid var-initializers. If a VarDeclaration line contained multiple variables, and the first variable had an illegal initializer-expression, the Declare() would return a Nop. AddVarDeclaration did not expect to see a Nop and would assert once we tried to process the second var-declaration. Now, we allow adding var declarations to a Nop. Bulked up some tests to cover local and global variables (since those are parsed in separate functions) and to check both the first initializer as well as follow-on initializers (since those are parsed in separate parts of the var-decl handler). Change-Id: I66341191698175b490a659715cb8edaafe2f75ae Bug: oss-fuzz:39032 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/452696 Commit-Queue: John Stiles <johnstiles@google.com> Auto-Submit: John Stiles <johnstiles@google.com> Reviewed-by: Brian Osman <brianosman@google.com> 2021-09-24 19:11:16 +00:00			`1 error`