Add untrusted NaCl build for PPAPI proxy.

ppapi/proxy/plugin_main_nacl.cc

+/*
+ * Copyright (c) 2012 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "native_client/src/shared/ppapi_proxy/ppruntime.h"
+
+// This definition is weak to allow customers to override it when
+// initialization is needed before the main PPAPI processing happens.
+
+int __attribute__((weak)) main(int argc, char* argv[]) {

[Mark Seaborn, 2012/06/13 20:27:37]

This file looks roughly like NaCl's src/untrusted/irt_stub/plugin_main_irt.c,
except that from the Gyp files it looks like it's linked into the IRT.  Why is
this weak?  Who is overriding this?

Actually, I don't understand why you are defining main() at all.  The IRT does
not use a main(); it just has _start().

[bbudge, 2012/06/14 02:45:10]

This was copied from the SRPC proxy library, ppruntime. You're right, it's not
needed, so it's out.
On 2012/06/13 20:27:37, Mark Seaborn wrote:

+  return PpapiPluginMain();
+}
+