create GrTestUtils.h, move some common functions into it

src/gpu/effects/GrBitmapTextGeoProc.cpp

Index: src/gpu/effects/GrBitmapTextGeoProc.cpp
diff --git a/src/gpu/effects/GrBitmapTextGeoProc.cpp b/src/gpu/effects/GrBitmapTextGeoProc.cpp
index 25904f753f523f5d6a9ea365cd66eabc3fc63280..70b87467f2eefd913bc334c13b63e428101789cf 100644
--- a/src/gpu/effects/GrBitmapTextGeoProc.cpp
+++ b/src/gpu/effects/GrBitmapTextGeoProc.cpp
@@ -232,5 +232,5 @@ GrGeometryProcessor* GrBitmapTextGeoProc::TestCreate(SkRandom* random,
 
     return GrBitmapTextGeoProc::Create(GrRandomColor(random), textures[texIdx], params,
                                        format, random->nextBool(),
-                                       GrProcessorUnitTest::TestMatrix(random));
+                                       GrTest::TestMatrix(random));
 }