Add libyuv/version.h header to help users determine api

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/369009

git-svn-id: http://libyuv.googlecode.com/svn/trunk@151 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

@@ -1,6 +1,6 @@
 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 150
+Version: 151
 License: BSD
 License File: LICENSE
 

include/libyuv.h

@@ -20,5 +20,6 @@
 #include "libyuv/planar_functions.h"
 #include "libyuv/rotate.h"
 #include "libyuv/scale.h"
+#include "libyuv/version.h"
 #include "libyuv/video_common.h"
 #endif  // LIBYUV_INCLUDE_LIBYUV_H_

include/libyuv/version.h

@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2012 The LibYuv project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef INCLUDE_LIBYUV_VERSION_H_
+#define INCLUDE_LIBYUV_VERSION_H_
+
+#ifdef __cplusplus
+namespace libyuv {
+extern "C" {
+#endif
+
+#define LIBYUV_VERSION 151
+
+#ifdef __cplusplus
+}  // extern "C"
+}  // namespace libyuv
+#endif
+
+#endif  // INCLUDE_LIBYUV_VERSION_H_

libyuv.gyp

@@ -28,6 +28,7 @@
         'include/libyuv/scale.h',
         'include/libyuv/planar_functions.h',
         'include/libyuv/video_common.h',
+        'include/libyuv/version.h',
 
         # headers
         'source/rotate_priv.h',