Expose NaClAppSetDesc() to Chromium for use at startup

src/public/nacl_app.h

+/*
+ * Copyright (c) 2014 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef NATIVE_CLIENT_SRC_PUBLIC_NACL_APP_H_
+#define NATIVE_CLIENT_SRC_PUBLIC_NACL_APP_H_
+
+#include "native_client/src/include/nacl_base.h"
+
+EXTERN_C_BEGIN
+
+struct NaClApp;
+struct NaClDesc;
+
+/* Creates and returns a newly-initialized NaClApp. */
+struct NaClApp *NaClAppCreate(void);
+
+/*
+ * Sets entry number |fd| in the NaClApp's descriptor table to |desc|,
+ * removing any existing entry under |fd|.  Note that this takes
+ * ownership of |desc|.
+ */
+void NaClAppSetDesc(struct NaClApp *nap, int fd, struct NaClDesc *desc);
+
+EXTERN_C_END
+
+#endif