create GrTestUtils.h, move some common functions into it

src/gpu/effects/GrBitmapTextGeoProc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBitmapTextGeoProc.h"
 #include "GrFontAtlasSizes.h"
 #include "GrInvariantOutput.h"
@@ skipping 214 matching lines @@
         case 1:
             format = kA565_GrMaskFormat;
             break;
         case 2:
             format = kARGB_GrMaskFormat;
             break;
     }
 
     return GrBitmapTextGeoProc::Create(GrRandomColor(random), textures[texIdx], params,
                                        format, random->nextBool(),
-                                       GrProcessorUnitTest::TestMatrix(random));
+                                       GrTest::TestMatrix(random));
 }