Add REPORTF test macro.

tests/MathTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 #include "TestClassDef.h"
 #include "SkColorPriv.h"
@@ skipping 207 matching lines @@
     }
     if (x < -SK_MaxS32) {
         return ((int32_t)si) == SK_MinS32;
     }
     return si == ni;
 }
 
 static void assert_float_equal(skiatest::Reporter* reporter, const char op[],
                                float x, uint32_t ni, uint32_t si) {
     if (!equal_float_native_skia(x, ni, si)) {
-        SkString desc;
-        uint32_t xi = SkFloat2Bits(x);
-        desc.printf("%s float %g bits %x native %x skia %x\n", op, x, xi, ni, si);
-        reporter->reportFailed(desc);
+        ERRORF(reporter, "%s float %g bits %x native %x skia %x\n",
+               op, x, SkFloat2Bits(x), ni, si);
     }
 }
 
 static void test_float_cast(skiatest::Reporter* reporter, float x) {
     int ix = (int)x;
     int iix = SkFloatToIntCast(x);
     assert_float_equal(reporter, "cast", x, ix, iix);
 }
 
 static void test_float_floor(skiatest::Reporter* reporter, float x) {
@@ skipping 357 matching lines @@
     test_divmod<int16_t>(r);
 }
 
 DEF_TEST(divmod_s32, r) {
     test_divmod<int32_t>(r);
 }
 
 DEF_TEST(divmod_s64, r) {
     test_divmod<int64_t>(r);
 }