fixed GLVec4ScalarBench

bench/GLVec4ScalarBench.cpp

Index: bench/GLVec4ScalarBench.cpp
diff --git a/bench/GLVec4ScalarBench.cpp b/bench/GLVec4ScalarBench.cpp
index 373ae6b7bc763e8fa56c6aca20b0712a6d252535..8511637f11ab7229ec7dcb1af1246e3d5ac66486 100644
--- a/bench/GLVec4ScalarBench.cpp
+++ b/bench/GLVec4ScalarBench.cpp
@@ -145,7 +145,7 @@ GrGLuint GLVec4ScalarBench::setupShader(const GrGLContext* ctx) {
         fshaderTxt.append(";\n");
         fsOutName = oFragColor.c_str();
     } else {
-        fsOutName = "gl_FragColor";
+        fsOutName = "sk_FragColor";
     }