Rename existing 'Blend' enums/names to 'BlendFilter'.

Change-Id: I17c624e9145d7152f65695ca3ce4592a11bb09a2
Bug: skia:12080
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/418637
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/sksl/ir/SkSLFunctionDeclaration.cpp b/src/sksl/ir/SkSLFunctionDeclaration.cpp
index 09d1b29..68b0559 100644
--- a/src/sksl/ir/SkSLFunctionDeclaration.cpp
+++ b/src/sksl/ir/SkSLFunctionDeclaration.cpp
@@ -92,7 +92,7 @@
         ProgramKind kind = context.fConfig->fKind;
         if (isMain && (kind == ProgramKind::kRuntimeColorFilter ||
                        kind == ProgramKind::kRuntimeShader ||
-                       kind == ProgramKind::kRuntimeBlend ||
+                       kind == ProgramKind::kRuntimeBlendFilter ||
                        kind == ProgramKind::kFragmentProcessor)) {
             // We verify that the signature is fully correct later. For now, if this is an .fp or
             // runtime effect of any flavor, a float2 param is supposed to be the coords, and
@@ -178,7 +178,7 @@
             }
             break;
         }
-        case ProgramKind::kRuntimeBlend: {
+        case ProgramKind::kRuntimeBlendFilter: {
             // (half4|float4) main(half4|float4, half4|float4)
             if (!typeIsValidForColor(returnType)) {
                 errors.error(offset, "'main' must return: 'vec4', 'float4', or 'half4'");