Update libvpx snapshot to v0.9.7-p1 (Cayuga).

source/libvpx/vpx/vpx_decoder.h

Index: source/libvpx/vpx/vpx_decoder.h
===================================================================
--- source/libvpx/vpx/vpx_decoder.h	(revision 96967)
+++ source/libvpx/vpx/vpx_decoder.h	(working copy)
@@ -53,6 +53,10 @@
 #define VPX_CODEC_CAP_PUT_SLICE  0x10000 /**< Will issue put_slice callbacks */
 #define VPX_CODEC_CAP_PUT_FRAME  0x20000 /**< Will issue put_frame callbacks */
 #define VPX_CODEC_CAP_POSTPROC   0x40000 /**< Can postprocess decoded frame */
+#define VPX_CODEC_CAP_ERROR_CONCEALMENT   0x80000 /**< Can conceal errors due to
+                                                       packet loss */
+#define VPX_CODEC_CAP_INPUT_PARTITION   0x100000 /**< Can receive encoded frames
+                                                    one partition at a time */
 
     /*! \brief Initialization-time Feature Enabling
      *
@@ -62,6 +66,11 @@
      *  The available flags are specified by VPX_CODEC_USE_* defines.
      */
 #define VPX_CODEC_USE_POSTPROC   0x10000 /**< Postprocess decoded frame */
+#define VPX_CODEC_USE_ERROR_CONCEALMENT 0x20000 /**< Conceal errors in decoded
+                                                     frames */
+#define VPX_CODEC_USE_INPUT_PARTITION   0x40000 /**< The input frame should be
+                                                    passed to the decoder one
+                                                    partition at a time */
 
     /*!\brief Stream properties
      *
@@ -180,6 +189,11 @@
      * generated, as appropriate. Encoded data \ref MUST be passed in DTS (decode
      * time stamp) order. Frames produced will always be in PTS (presentation
      * time stamp) order.
+     * If the decoder is configured with VPX_CODEC_USE_INPUT_PARTITION enabled,
+     * data and data_sz must contain at most one encoded partition. When no more
+     * data is available, this function should be called with NULL as data and 0
+     * as data_sz. The memory passed to this function must be available until
+     * the frame has been decoded.
      *
      * \param[in] ctx          Pointer to this instance's context
      * \param[in] data         Pointer to this block of new coded data. If