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vp10: allow forward updates for uv_mode probabilities.

See issue 1040 point 4.

Change-Id: I79e06bd71a27f45770c760c47dc71bc3767a77a0

--- a/vp10/decoder/decodeframe.c

+++ b/vp10/decoder/decodeframe.c

@@ -2145,6 +2145,12 @@

       for (i = 0; i < INTRA_MODES - 1; ++i)

         vp10_diff_update_prob(&r, &fc->y_mode_prob[j][i]);

+#if CONFIG_MISC_FIXES

+    for (j = 0; j < INTRA_MODES; j++)

+      for (i = 0; i < INTRA_MODES - 1; ++i)

+        vp10_diff_update_prob(&r, &fc->uv_mode_prob[j][i]);

+#endif

+

     for (j = 0; j < PARTITION_CONTEXTS; ++j)

       for (i = 0; i < PARTITION_TYPES - 1; ++i)

         vp10_diff_update_prob(&r, &fc->partition_prob[j][i]);

--- a/vp10/encoder/bitstream.c

+++ b/vp10/encoder/bitstream.c

@@ -1291,6 +1291,12 @@

       prob_diff_update(vp10_intra_mode_tree, cm->fc->y_mode_prob[i],

                        counts->y_mode[i], INTRA_MODES, &header_bc);

+#if CONFIG_MISC_FIXES

+    for (i = 0; i < INTRA_MODES; ++i)

+      prob_diff_update(vp10_intra_mode_tree, cm->fc->uv_mode_prob[i],

+                       counts->uv_mode[i], INTRA_MODES, &header_bc);

+#endif

+

     for (i = 0; i < PARTITION_CONTEXTS; ++i)

       prob_diff_update(vp10_partition_tree, fc->partition_prob[i],

                        counts->partition[i], PARTITION_TYPES, &header_bc);