Change WGSL indentation level to 2 spaces.

WGSL often ends up with very deep brace-scoping, since it mandates
braced blocks in many places where GLSL/SkSL does not, and we
compensate by always emitting a set of braces. Additionally, we
are going to need an extra braced-scope around every function body
now, since we will need to inject an extra return statement at the
end of some functions. (WGSL will report an error if a function's
only return is inside a loop structure, even if it unambiguously
returns from inside the loop, and the proposed fix from the WGSL
team is to add a dead return at the bottom and let Tint optimize
it away.)

Change-Id: I4a48b693870b91410f104d71d2f88b33543e4776
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/708378
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Arman Uguray <armansito@google.com>
94 files changed