Disable the unit test of ArfFreq for BIDIR_PRED

The test in arf_freq assumes any no-show frame as ALTREF_FRAME and
then calculate the minimum run between two consecutive ALTREF_FRAME's
based on this assumption. As BWDREF_FRAME is also a no-show frame and
the minimum run between two consecutive BWDREF_FRAME's may vary
between 1 and any arbitrary positive number as long as it does not
exceed the golden frame group interval, this test does not apply to
the experiment of BIDIR_PRED.

Change-Id: I70efb2c691fdc18601dbb8a7735ac2f27817e75a

test/vp9_arf_freq_test.cc

@@ -230,9 +230,13 @@ VP9_INSTANTIATE_TEST_CASE(
     ::testing::ValuesIn(kEncodeVectors),
     ::testing::ValuesIn(kMinArfVectors));
 
-#if CONFIG_VP9_HIGHBITDEPTH
+#if CONFIG_VP9_HIGHBITDEPTH || CONFIG_BIDIR_PRED
 #if CONFIG_VP10_ENCODER
 // TODO(angiebird): 25-29 fail in high bitdepth mode.
+// TODO(zoeliu): This ArfFreqTest does not work with BWDREF_FRAME, as
+// BWDREF_FRAME is also a non-show frame, and the minimum run between two
+// consecutive BWDREF_FRAME's may vary between 1 and any arbitrary positive
+// number as long as it does not exceed the gf_group interval.
 INSTANTIATE_TEST_CASE_P(
     DISABLED_VP10, ArfFreqTestLarge,
     ::testing::Combine(
@@ -248,5 +252,5 @@ VP10_INSTANTIATE_TEST_CASE(
     ::testing::ValuesIn(kTestVectors),
     ::testing::ValuesIn(kEncodeVectors),
     ::testing::ValuesIn(kMinArfVectors));
-#endif  // CONFIG_VP9_HIGHBITDEPTH
+#endif  // CONFIG_VP9_HIGHBITDEPTH || CONFIG_BIDIR_PRED
 }  // namespace