Add ability to add general layout qualifiers GrGLSLShaderVar

src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp

Index: src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
diff --git a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
index 54e0b7f9561eded3ab6a2c20cf1fe0e54b004bc8..90e20437e17ba4aeeb16546a078471c6158f1bad 100644
--- a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
@@ -129,7 +129,7 @@ const char* GrGLSLFragmentShaderBuilder::fragmentPosition() {
                                     GrGLSLShaderVar::kIn_TypeModifier,
                                     "gl_FragCoord",
                                     kDefault_GrSLPrecision,
-                                    GrGLSLShaderVar::kUpperLeft_Origin);
+                                    "origin_upper_left");
             fSetupFragPosition = true;
         }
         return "gl_FragCoord";