duplicate I420Rect prototype into convert for webrtc

TBR=harryjin@google.com
BUG=libyuv:618

Review URL: https://codereview.chromium.org/2132993003 .

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1603
+Version: 1604
 License: BSD
 License File: LICENSE
 

include/libyuv/convert.h

@@ -185,6 +185,16 @@ int ARGB4444ToI420(const uint8* src_frame, int src_stride_frame,
                    uint8* dst_v, int dst_stride_v,
                    int width, int height);
 
+// Draw a rectangle into I420.
+// TODO(fbarchard): add planar_functions.h to webrtc includes
+// https://bugs.chromium.org/p/libyuv/issues/detail?id=618
+LIBYUV_API
+int I420Rect(uint8* dst_y, int dst_stride_y,
+             uint8* dst_u, int dst_stride_u,
+             uint8* dst_v, int dst_stride_v,
+             int x, int y, int width, int height,
+             int value_y, int value_u, int value_v);
+
 #ifdef HAVE_JPEG
 // src_width/height provided by capture.
 // dst_width/height for clipping determine final size.

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1603
+#define LIBYUV_VERSION 1604
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT