Add a placeholder file for ARM64 Scale Neon implementation

BUS=319
TESTED=libyuv_unit_test
R=fbarchard@google.com

Review URL: https://webrtc-codereview.appspot.com/18179004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1051 16f28f9a-4ce2-e073-06de-1de4eb20be90

include/libyuv/scale_row.h

@@ -51,6 +51,14 @@ extern "C" {
 #define HAS_SCALEROWDOWN38_NEON
 #define HAS_SCALEARGBROWDOWNEVEN_NEON
 #define HAS_SCALEARGBROWDOWN2_NEON
+#elif !defined(LIBYUV_DISABLE_NEON) && !defined(__native_client__) && \
+    (defined(__aarch64__) || defined(LIBYUV_NEON))
+/* #define HAS_SCALEROWDOWN2_NEON */
+/* #define HAS_SCALEROWDOWN4_NEON */
+/* #define HAS_SCALEROWDOWN34_NEON */
+/* #define HAS_SCALEROWDOWN38_NEON */
+/* #define HAS_SCALEARGBROWDOWNEVEN_NEON */
+/* #define HAS_SCALEARGBROWDOWN2_NEON */
 #endif
 
 // The following are available on Mips platforms:

libyuv.gyp

@@ -62,6 +62,7 @@
             'source/row_neon.cc',
             'source/row_neon64.cc',
             'source/scale_neon.cc',
+            'source/scale_neon64.cc',
           ],
         },
       ],