added support for PLS path rendering

src/gpu/glsl/GrGLSL.h

Index: src/gpu/glsl/GrGLSL.h
diff --git a/src/gpu/glsl/GrGLSL.h b/src/gpu/glsl/GrGLSL.h
index f2accc54e954c35fe4b7e15d27ed0cc8ec5c2ea4..dc53d7befaa65e551d77058c7854f5ba0691fd72 100644
--- a/src/gpu/glsl/GrGLSL.h
+++ b/src/gpu/glsl/GrGLSL.h
@@ -100,6 +100,10 @@ static inline const char* GrGLSLTypeString(GrSLType t) {
             return "samplerExternalOES";
         case kSampler2DRect_GrSLType:
             return "sampler2DRect";
+        case kBool_GrSLType:
+            return "bool";
+        case kInt_GrSLType:
+            return "int";
         default:
             SkFAIL("Unknown shader var type.");
             return ""; // suppress warning