libvpx: Add VP9 decoder.

source/libvpx/vpx/vp8dx.h

Index: source/libvpx/vpx/vp8dx.h
===================================================================
--- source/libvpx/vpx/vp8dx.h	(revision 172621)
+++ source/libvpx/vpx/vp8dx.h	(working copy)
@@ -31,7 +31,11 @@
  * @{
  */
 extern vpx_codec_iface_t  vpx_codec_vp8_dx_algo;
-extern vpx_codec_iface_t* vpx_codec_vp8_dx(void);
+extern vpx_codec_iface_t *vpx_codec_vp8_dx(void);
+
+/* TODO(jkoleszar): These move to VP9 in a later patch set. */
+extern vpx_codec_iface_t  vpx_codec_vp9_dx_algo;
+extern vpx_codec_iface_t *vpx_codec_vp9_dx(void);
 /*!@} - end algorithm interface member group*/
 
 /* Include controls common to both the encoder and decoder */
@@ -45,23 +49,22 @@
  *
  * \sa #vpx_codec_control
  */
-enum vp8_dec_control_id
-{
-    /** control function to get info on which reference frames were updated
-     *  by the last decode
-     */
-    VP8D_GET_LAST_REF_UPDATES = VP8_DECODER_CTRL_ID_START,
+enum vp8_dec_control_id {
+  /** control function to get info on which reference frames were updated
+   *  by the last decode
+   */
+  VP8D_GET_LAST_REF_UPDATES = VP8_DECODER_CTRL_ID_START,
 
-    /** check if the indicated frame is corrupted */
-    VP8D_GET_FRAME_CORRUPTED,
+  /** check if the indicated frame is corrupted */
+  VP8D_GET_FRAME_CORRUPTED,
 
-    /** control function to get info on which reference frames were used
-     *  by the last decode
-     */
-    VP8D_GET_LAST_REF_USED,
+  /** control function to get info on which reference frames were used
+   *  by the last decode
+   */
+  VP8D_GET_LAST_REF_USED,
 
-    VP8_DECODER_CTRL_ID_MAX
-} ;
+  VP8_DECODER_CTRL_ID_MAX
+};
 
 
 /*!\brief VP8 decoder control function parameter type