Add gl_SampleMask functionality to fragment builders

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 6fc8f83c7a3ca1be80fada8a9ef72a12d923ca02..b13113a28903e9f2009805db46966fac231f83dc 100644
--- a/src/gpu/glsl/GrGLSL.h
+++ b/src/gpu/glsl/GrGLSL.h
@@ -37,9 +37,17 @@ enum GrGLSLGeneration {
      */
     k330_GrGLSLGeneration,
     /**
+     * Desktop GLSL 4.00
+     */
+    k400_GrGLSLGeneration,
+    /**
      * ES GLSL 3.10 only TODO Make GLSLCap objects to make this more granular
      */
     k310es_GrGLSLGeneration,
+    /**
+     * ES GLSL 3.20
+     */
+    k320es_GrGLSLGeneration,
 };
 
 bool GrGLSLSupportsNamedFragmentShaderOutputs(GrGLSLGeneration);