Give strokerectbatch a proper home

src/gpu/GrStrokeRectBatch.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 "GrStrokeRectBatch.h"
+#include "GrBatchTest.h"
+#include "SkRandom.h"
+
+#ifdef GR_TEST_UTILS
+
+BATCH_TEST_DEFINE(GrStrokeRectBatch) {
+    GrStrokeRectBatch::Geometry geometry;
+    geometry.fViewMatrix = GrTest::TestMatrix(random);
+    geometry.fColor = GrRandomColor(random);
+    geometry.fRect = GrTest::TestRect(random);
+    geometry.fStrokeWidth = random->nextBool() ? 0.0f : 1.0f;
+
+    return GrStrokeRectBatch::Create(geometry, random->nextBool());
+}
+
+#endif