Set up NaClChromeMainArgs number_of_cores member so apps can size threadpools appropriately

chrome/nacl/nacl_listener.h

 // 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.
 
 #ifndef CHROME_NACL_NACL_LISTENER_H_
 #define CHROME_NACL_NACL_LISTENER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 16 matching lines @@
   // Listen for a request to launch a NaCl module.
   void Listen();
 
   bool Send(IPC::Message* msg);
 
 #if defined(OS_LINUX)
   void set_prereserved_sandbox_size(size_t prereserved_sandbox_size) {
     prereserved_sandbox_size_ = prereserved_sandbox_size;
   }
 #endif
+#if defined(OS_POSIX)
+  void set_number_of_cores(int number_of_cores) {
+    number_of_cores_ = number_of_cores;
+  }
+#endif
 
  private:
   void OnStart(const nacl::NaClStartParams& params);
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 
   // A channel back to the browser.
   scoped_ptr<IPC::SyncChannel> channel_;
 
   // A filter that allows other threads to use the channel.
   scoped_refptr<IPC::SyncMessageFilter> filter_;
 
   base::WaitableEvent shutdown_event_;
   base::Thread io_thread_;
 
 #if defined(OS_LINUX)
   size_t prereserved_sandbox_size_;
 #endif
+#if defined(OS_POSIX)
+  /*
+   * The outer sandbox on Linux and OSX prevents
+   * sysconf(_SC_NPROCESSORS) from working; in Windows, there are no
+   * problems with invoking GetSystemInfo.  Therefore, only in
+   * OS_POSIX do we need to supply the number of cores into
+   * NaClChromeMainArgs object.
+   */
+  int number_of_cores_;
+#endif
 
   // Used to identify what thread we're on.
   MessageLoop* main_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClListener);
 };
 
 #endif  // CHROME_NACL_NACL_LISTENER_H_