Initial CL to create GrBatchTest infrastructure

src/gpu/GrTestUtils.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 "GrTestUtils.h"
 #include "SkMatrix.h"
 
+#ifdef GR_TEST_UTILS
+
 namespace GrTest {
 const SkMatrix& TestMatrix(SkRandom* random) {
     static SkMatrix gMatrices[5];
     static bool gOnce;
     if (!gOnce) {
         gMatrices[0].reset();
         gMatrices[1].setTranslate(SkIntToScalar(-100), SkIntToScalar(100));
         gMatrices[2].setRotate(SkIntToScalar(17));
         gMatrices[3].setRotate(SkIntToScalar(185));
         gMatrices[3].postTranslate(SkIntToScalar(66), SkIntToScalar(-33));
         gMatrices[3].postScale(SkIntToScalar(2), SK_ScalarHalf);
         gMatrices[4].setRotate(SkIntToScalar(215));
         gMatrices[4].set(SkMatrix::kMPersp0, 0.00013f);
         gMatrices[4].set(SkMatrix::kMPersp1, -0.000039f);
         gOnce = true;
     }
     return gMatrices[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gMatrices)))];
 }
+
+const SkRect& TestRect(SkRandom* random) {
+    static SkRect gRects[1];

[brucedawson, 2015/04/30 20:19:35]

Why is this array declared as having just one element when seven elements are
referenced down below? This triggers a series of /analyze warnings, including
this one:

src\third_party\skia\src\gpu\grtestutils.cpp(67) : warning C6201: Index '6' is
out of valid index range '0' to '0' for possibly stack allocated buffer 'struct
SkRect * `struct SkRect const & __cdecl GrTest::TestRect(class SkRandom
*)'::`2'::gRects'.

+    static bool gOnce;
+    if (!gOnce) {
+        gRects[0] = SkRect::MakeWH(1.f, 1.f);
+        gRects[1] = SkRect::MakeWH(1.0f, 256.0f);
+        gRects[2] = SkRect::MakeWH(256.0f, 1.0f);
+        gRects[4] = SkRect::MakeLargest();
+        gRects[5] = SkRect::MakeLTRB(-65535.0f, -65535.0f, 65535.0f, 65535.0f);
+        gRects[6] = SkRect::MakeLTRB(10.0f, 10.0f, -10.0f, -10.0f);
+        gOnce = true;
+    }
+    return gRects[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gRects)))];
+}
 };
+
+#endif