libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_enums.h

Index: source/libvpx/vp9/common/vp9_enums.h
===================================================================
--- source/libvpx/vp9/common/vp9_enums.h	(revision 284462)
+++ source/libvpx/vp9/common/vp9_enums.h	(working copy)
@@ -25,15 +25,18 @@
 
 #define MI_MASK (MI_BLOCK_SIZE - 1)
 
-// Bitstream profiles indicated by 2 bits in the uncompressed header.
-// 00: Profile 0. 4:2:0 only.
-// 10: Profile 1. adds 4:4:4, 4:2:2, alpha.
-// 01: Profile 2. Supports 10-bit and 12-bit color only.
-// 11: Undefined profile.
+// Bitstream profiles indicated by 2-3 bits in the uncompressed header.
+// 00: Profile 0.  8-bit 4:2:0 only.
+// 10: Profile 1.  Adds 4:4:4, 4:2:2, alpha to Profile 0.
+// 01: Profile 2.  Supports 10-bit and 12-bit color only, with 4:2:0 sampling.
+// 110: Profile 3. Supports 10-bit and 12-bit color only, with 4:2:2/4:4:4
+//                 sampling and alpha.
+// 111: Undefined profile.
 typedef enum BITSTREAM_PROFILE {
   PROFILE_0,
   PROFILE_1,
   PROFILE_2,
+  PROFILE_3,
   MAX_PROFILES
 } BITSTREAM_PROFILE;