create GrTestUtils.h, move some common functions into it

src/gpu/GrDefaultGeoProcFactory.cpp

Index: src/gpu/GrDefaultGeoProcFactory.cpp
diff --git a/src/gpu/GrDefaultGeoProcFactory.cpp b/src/gpu/GrDefaultGeoProcFactory.cpp
index ea52462788d173d65a726077b50eada752f3455b..e31cdfe71288789b92472891970e0d9798f2d2ef 100644
--- a/src/gpu/GrDefaultGeoProcFactory.cpp
+++ b/src/gpu/GrDefaultGeoProcFactory.cpp
@@ -265,8 +265,8 @@ GrGeometryProcessor* DefaultGeoProc::TestCreate(SkRandom* random,
 
     return DefaultGeoProc::Create(flags,
                                   GrRandomColor(random),
-                                  GrProcessorUnitTest::TestMatrix(random),
-                                  GrProcessorUnitTest::TestMatrix(random),
+                                  GrTest::TestMatrix(random),
+                                  GrTest::TestMatrix(random),
                                   random->nextBool(),
                                   GrRandomCoverage(random));
 }