Add unit tests to text context

src/gpu/GrBatchTest.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrBatchTest_DEFINED
 #define GrBatchTest_DEFINED
 
@@ skipping 11 matching lines @@
  */
 
 // Batches should define test functions using BATCH_TEST_DEFINE.  The other macros defined below
 // are used exclusively by the test harness.
 typedef GrBatch* (*BatchTestFunc)(SkRandom* random, GrContext* context);
 #define BATCH_TEST_DEFINE(Batch) \
     GrBatch* Batch##__Test(SkRandom* random, GrContext* context)
 #define BATCH_TEST_EXTERN(Batch) \
     extern GrBatch* Batch##__Test(SkRandom*, GrContext* context);
 #define BATCH_TEST_ENTRY(Batch) \
-        Batch##__Test
+    Batch##__Test
+#define BATCH_TEST_FRIEND(Batch) \
+    friend GrBatch* Batch##__Test(SkRandom* random, GrContext* context);
 
 GrBatch* GrRandomBatch(SkRandom*, GrContext*);
 
 #endif
 #endif