vp9: add fate sample for parallelmode.

This disables backward probability updates, which makes the codec more
friendly for frame-level multi-threading.

tests/fate/vpx.mak

@@ -81,6 +81,7 @@ $(eval $(call FATE_VP9_SUITE,03-deltaq,$(1),$(2)))
 $(eval $(call FATE_VP9_SUITE,2pass-akiyo,$(1),$(2)))
 $(eval $(call FATE_VP9_SUITE,segmentation-akiyo,$(1),$(2)))
 $(eval $(call FATE_VP9_SUITE,tiling-pedestrian,$(1),$(2)))
+$(eval $(call FATE_VP9_SUITE,parallelmode-akiyo,$(1),$(2)))
 endef
 
 $(eval $(call FATE_VP9_FULL))

tests/ref/fate/vp9-parallelmode-akiyo

+#format: frame checksums
+#version: 1
+#hash: MD5
+#tb 0: 1001/30000
+#stream#, dts,        pts, duration,     size, hash
+0,          0,          0,        1,   152064, f5bc602db15c69545307e56990f9f9f7
+0,          1,          1,        1,   152064, b56428b6f97669938c8b9b05458fca70
+0,          2,          2,        1,   152064, b56428b6f97669938c8b9b05458fca70
+0,          3,          3,        1,   152064, 3098d2eb9129beddb6975e3ae332a4ab
+0,          4,          4,        1,   152064, 6719f3a6c22f05dc53dd3906e4154bd7
+0,          5,          5,        1,   152064, 8cd9a12761e35f67c278949cd3aee88f
+0,          6,          6,        1,   152064, 8cd9a12761e35f67c278949cd3aee88f
+0,          7,          7,        1,   152064, 0160dec415234d39f148e91f72d264ab
+0,          8,          8,        1,   152064, 9f90d96d67d9e9b3716abe2a3faa854e
+0,          9,          9,        1,   152064, 1edb312f9d0be7835b964a3ffa014759
+0,         10,         10,        1,   152064, 7614fd674609afccacd355aa2f714c75
+0,         11,         11,        1,   152064, cb46868706dd246878bebf354aff66f4
+0,         12,         12,        1,   152064, da36fe96cb4956036f890bb2f6d05b98
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+0,         15,         15,        1,   152064, b0bf25e139556bd9067616db7e4f47b5
+0,         16,         16,        1,   152064, e70d5480c1f82fc877bbe1a8093f807a
+0,         17,         17,        1,   152064, 622fb43e6ff63834f0f680a68b49f6e6
+0,         18,         18,        1,   152064, c331ebba15f2290f174533dbffb3c27b
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+0,         20,         20,        1,   152064, b95c7699639c51b08b3615ef7fa7046c
+0,         21,         21,        1,   152064, b4774148c71c9c184bda5a18294e459c
+0,         22,         22,        1,   152064, 795b7ce4c5e0dc343bd8f80ad6c1a454
+0,         23,         23,        1,   152064, 19163601b7b6138e2940cf28f6df6c7f
+0,         24,         24,        1,   152064, b9b388e0892c52df0680a30bfa954506