merge vatrace

Signed-off-by: Austin Yuan <shengquan.yuan@gmail.com>

va/Makefile.am

@@ -42,7 +42,7 @@ libva_x11_la_DEPENDENCIES = $(libvacorelib) x11/libva_x11.la
 
 SUBDIRS = x11
 
-libva_la_SOURCES = va.c
+libva_la_SOURCES = va.c va_trace.c
 
 libvaincludedir = ${includedir}/va
 libvainclude_HEADERS = va.h va_x11.h va_backend.h va_version.h

va/va_backend.h

@@ -353,6 +353,16 @@ struct VADriverVTable
                 VASurfaceID *surface	           /* out */
         );
 
+        VAStatus (*vaBufferInfo) (
+                   VADriverContextP ctx,
+                   VAContextID context, /* in */
+                   VABufferID buf_id, /* in */
+                   VABufferType *type,    /* out */
+                   unsigned int *size,    /* out */
+                   unsigned int *num_elements /* out */
+        );
+
+    
         VAStatus (*vaCopySurfaceToBuffer) (
 		VADriverContextP ctx,
                 VASurfaceID surface,