Add hairlines batch unit test

src/gpu/GrTestUtils.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTestUtils.h"
 #include "SkMatrix.h"
+#include "SkPath.h"
 #include "SkRRect.h"
 
 #ifdef GR_TEST_UTILS
 
 namespace GrTest {
 const SkMatrix& TestMatrix(SkRandom* random) {
     static SkMatrix gMatrices[5];
     static bool gOnce;
     if (!gOnce) {
         gOnce = true;
@@ skipping 93 matching lines @@
         // true round rect with elliptical corners
         gRRect[3].setRectXY(rectangle, 2.0f, 1.0f);
 
         for (size_t i = 0; i < SK_ARRAY_COUNT(gRRect); i++) {
             SkASSERT(gRRect[i].isSimple());
         }
     }
     return gRRect[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gRRect)))];
 }
 
+const SkPath& TestPath(SkRandom* random) {
+    static SkPath gPath[7];
+    static bool gOnce;
+    if (!gOnce) {
+        gOnce = true;
+        // line
+        gPath[0].moveTo(0.f, 0.f);
+        gPath[0].lineTo(10.f, 10.f);
+        // quad
+        gPath[1].moveTo(0.f, 0.f);
+        gPath[1].quadTo(10.f, 10.f, 20.f, 20.f);
+        // conic
+        gPath[2].moveTo(0.f, 0.f);
+        gPath[2].conicTo(10.f, 10.f, 20.f, 20.f, 1.f);
+        // cubic
+        gPath[3].moveTo(0.f, 0.f);
+        gPath[3].cubicTo(10.f, 10.f, 20.f, 20.f, 30.f, 30.f);
+        // all three
+        gPath[4].moveTo(0.f, 0.f);
+        gPath[4].lineTo(10.f, 10.f);
+        gPath[4].quadTo(10.f, 10.f, 20.f, 20.f);
+        gPath[4].conicTo(10.f, 10.f, 20.f, 20.f, 1.f);
+        gPath[4].cubicTo(10.f, 10.f, 20.f, 20.f, 30.f, 30.f);
+        // convex
+        gPath[5].moveTo(0.0f, 0.0f);
+        gPath[5].lineTo(10.0f, 0.0f);
+        gPath[5].lineTo(10.0f, 10.0f);
+        gPath[5].lineTo(0.0f, 10.0f);
+        gPath[5].close();
+        // concave
+        gPath[6].moveTo(0.0f, 0.0f);
+        gPath[6].lineTo(5.0f, 5.0f);
+        gPath[6].lineTo(10.0f, 0.0f);
+        gPath[6].lineTo(10.0f, 10.0f);
+        gPath[6].lineTo(0.0f, 10.0f);
+        gPath[6].close();
+    }
+
+    return gPath[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gPath)))];
+}
+
 };
 
 #endif