Have each SandboxedProcessLauncherDelegate maintain a zygote.

components/nacl/browser/nacl_process_host.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 COMPONENTS_NACL_BROWSER_NACL_PROCESS_HOST_H_
 #define COMPONENTS_NACL_BROWSER_NACL_PROCESS_HOST_H_
 
 #include "build/build_config.h"
 
 #include <stddef.h>
@@ skipping 75 matching lines @@
       bool off_the_record,
       NaClAppProcessType process_type,
       const base::FilePath& profile_directory);
   ~NaClProcessHost() override;
 
   void OnProcessCrashed(int exit_status) override;
 
   // Do any minimal work that must be done at browser startup.
   static void EarlyStartup();
 
+#if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
+  // Launch the NaCl zygote early in the browser startup.
+  static void EarlyZygoteLaunch();
+#endif  // defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
+
   // Specifies throttling time in milliseconds for PpapiHostMsg_Keepalive IPCs.
   static void SetPpapiKeepAliveThrottleForTesting(unsigned milliseconds);
 
   // Initialize the new NaCl process. Result is returned by sending ipc
   // message reply_msg.
   void Launch(NaClHostMessageFilter* nacl_host_message_filter,
               IPC::Message* reply_msg,
               const base::FilePath& manifest_path);
 
   void OnChannelConnected(int32_t peer_pid) override;
@@ skipping 158 matching lines @@
   base::File socket_for_sel_ldr_;
 
   base::WeakPtrFactory<NaClProcessHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClProcessHost);
 };
 
 }  // namespace nacl
 
 #endif  // COMPONENTS_NACL_BROWSER_NACL_PROCESS_HOST_H_