Standardize naming on CoverageAsAlpha (rather than AlphaAsCoverage)

Also fix a spelling mistake: Coveage -> Coverage

Bug: skia:
Change-Id: I296415ca194b0805470596d297e1d815f43b404a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201394
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/ops/GrQuadPerEdgeAA.cpp b/src/gpu/ops/GrQuadPerEdgeAA.cpp
index 2593875..9716e31 100644
--- a/src/gpu/ops/GrQuadPerEdgeAA.cpp
+++ b/src/gpu/ops/GrQuadPerEdgeAA.cpp
@@ -616,7 +616,7 @@
 
 static CoverageMode get_mode_for_spec(const GrQuadPerEdgeAA::VertexSpec& spec) {
     if (spec.usesCoverageAA()) {
-        if (spec.compatibleWithAlphaAsCoverage() && spec.hasVertexColors()) {
+        if (spec.compatibleWithCoverageAsAlpha() && spec.hasVertexColors()) {
             return CoverageMode::kWithColor;
         } else {
             return CoverageMode::kWithPosition;