move constants into common

include/libyuv/row.h

Index: include/libyuv/row.h
diff --git a/include/libyuv/row.h b/include/libyuv/row.h
index d5e7eacdca18736e558ba333f75e41f7bf499f3d..66c4a649debc39132ff9cb904839cd626d13f01b 100644
--- a/include/libyuv/row.h
+++ b/include/libyuv/row.h
@@ -456,6 +456,15 @@ struct YuvConstants {
   lvec16 kYToRgb;
 };
 
+// Offsets into YuvConstants structure
+#define KUVTOB   0
+#define KUVTOG   32
+#define KUVTOR   64
+#define KUVBIASB 96
+#define KUVBIASG 128
+#define KUVBIASR 160
+#define KYTORGB  192
+
 struct YuvConstantsNEON {
     uvec8 kUVToRB;
     uvec8 kUVToG;
@@ -463,6 +472,14 @@ struct YuvConstantsNEON {
     vec32 kYToRgb;
 };
 
+extern struct YuvConstants kYuvConstants;
+extern struct YuvConstants kYvuConstants;
+extern struct YuvConstants kYuvJConstants;
+extern struct YuvConstants kYuvHConstants;
+extern struct YuvConstantsNEON kYuvConstantsNEON;
+extern struct YuvConstantsNEON kYuvJConstantsNEON;
+extern struct YuvConstantsNEON kYuvHConstantsNEON;
+
 #if defined(__APPLE__) || defined(__x86_64__) || defined(__llvm__)
 #define OMITFP
 #else