Re-land of "converted GrSimpleTextureEffect to sksl"

This reverts commit baf981f71614e7a2fbe6af2726e65126d431ed8e.

Bug: skia:
Change-Id: I36f6bfb616f1ec2b89043e3a6f7cbdf473bc9588
Reviewed-on: https://skia-review.googlesource.com/22369
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/SkSLSPIRVCodeGenerator.h b/src/sksl/SkSLSPIRVCodeGenerator.h
index 9944428..1ce9d0c 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.h
+++ b/src/sksl/SkSLSPIRVCodeGenerator.h
@@ -185,6 +185,9 @@
      */
     SpvId foldToBool(SpvId id, const Type& operandType, OutputStream& out);
 
+    SpvId writeMatrixComparison(const Type& operandType, SpvId lhs, SpvId rhs, SpvOp_ floatOperator,
+                                SpvOp_ intOperator, OutputStream& out);
+
     SpvId writeBinaryOperation(const Type& resultType, const Type& operandType, SpvId lhs,
                                SpvId rhs, SpvOp_ ifFloat, SpvOp_ ifInt, SpvOp_ ifUInt,
                                SpvOp_ ifBool, OutputStream& out);