Fork VP9 and VP10 codebase

This commit folks the VP9 and VP10 codebase and makes libvpx
support VP8, VP9, and VP10.

Change-Id: I81782e0b809acb3c9844bee8c8ec8f4d5e8fa356
diff --git a/vp10/vp10dx.mk b/vp10/vp10dx.mk
new file mode 100644
index 0000000..dd37354
--- /dev/null
+++ b/vp10/vp10dx.mk
@@ -0,0 +1,33 @@
+##
+##  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
+
+VP10_DX_EXPORTS += exports_dec
+
+VP10_DX_SRCS-yes += $(VP10_COMMON_SRCS-yes)
+VP10_DX_SRCS-no  += $(VP10_COMMON_SRCS-no)
+VP10_DX_SRCS_REMOVE-yes += $(VP10_COMMON_SRCS_REMOVE-yes)
+VP10_DX_SRCS_REMOVE-no  += $(VP10_COMMON_SRCS_REMOVE-no)
+
+VP10_DX_SRCS-yes += vp9_dx_iface.c
+
+VP10_DX_SRCS-yes += decoder/vp9_decodemv.c
+VP10_DX_SRCS-yes += decoder/vp9_decodeframe.c
+VP10_DX_SRCS-yes += decoder/vp9_decodeframe.h
+VP10_DX_SRCS-yes += decoder/vp9_detokenize.c
+VP10_DX_SRCS-yes += decoder/vp9_decodemv.h
+VP10_DX_SRCS-yes += decoder/vp9_detokenize.h
+VP10_DX_SRCS-yes += decoder/vp9_dthread.c
+VP10_DX_SRCS-yes += decoder/vp9_dthread.h
+VP10_DX_SRCS-yes += decoder/vp9_decoder.c
+VP10_DX_SRCS-yes += decoder/vp9_decoder.h
+VP10_DX_SRCS-yes += decoder/vp9_dsubexp.c
+VP10_DX_SRCS-yes += decoder/vp9_dsubexp.h
+
+VP10_DX_SRCS-yes := $(filter-out $(VP10_DX_SRCS_REMOVE-yes),$(VP10_DX_SRCS-yes))