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/test/decode_api_test.cc b/test/decode_api_test.cc
index c10a44a..318351b 100644
--- a/test/decode_api_test.cc
+++ b/test/decode_api_test.cc
@@ -27,6 +27,9 @@
 #if CONFIG_VP9_DECODER
     &vpx_codec_vp9_dx_algo,
 #endif
+#if CONFIG_VP10_DECODER
+    &vpx_codec_vp10_dx_algo,
+#endif
   };
   uint8_t buf[1] = {0};
   vpx_codec_ctx_t dec;