Add support for writing byte arrays to parcels

b/13418320

Change-Id: I2285df9e9d3dc8a6a54055b13b352b81660bf45d
diff --git a/include/binder/Parcel.h b/include/binder/Parcel.h
index c95f297..98f20de 100644
--- a/include/binder/Parcel.h
+++ b/include/binder/Parcel.h
@@ -102,6 +102,7 @@
     status_t            writeStrongBinder(const sp<IBinder>& val);
     status_t            writeWeakBinder(const wp<IBinder>& val);
     status_t            writeInt32Array(size_t len, const int32_t *val);
+    status_t            writeByteArray(size_t len, const uint8_t *val);
 
     template<typename T>
     status_t            write(const Flattenable<T>& val);