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 ac38522ca1401613f36e643228fd6272c344bf98..c7bbf54fd7065df0c9c9f3b1f63e6b1bad0c982e 100644
--- a/src/gpu/glsl/GrGLSL.h
+++ b/src/gpu/glsl/GrGLSL.h
@@ -87,6 +87,10 @@ static inline const char* GrGLSLTypeString(GrSLType t) {
             return "sampler2D";
         case kSamplerExternal_GrSLType:
             return "samplerExternalOES";
+        case kBool_GrSLType:
+            return "bool";
+        case kInt_GrSLType:
+            return "int";
         default:
             SkFAIL("Unknown shader var type.");
             return ""; // suppress warning