Have each SandboxedProcessLauncherDelegate maintain a zygote.

content/browser/ppapi_plugin_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 CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
 #define CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
 
 #include <stdint.h>
 
 #include <queue>
@@ skipping 98 matching lines @@
   // channel is ready or if there's an error.
   void OpenChannelToPlugin(Client* client);
 
   BrowserPpapiHostImpl* host_impl() { return host_impl_.get(); }
   const BrowserChildProcessHostImpl* process() { return process_.get(); }
   const base::FilePath& plugin_path() const { return plugin_path_; }
   const base::FilePath& profile_data_directory() const {
     return profile_data_directory_;
   }
 
+#if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
+  // Launch the zygote early in the browser startup.
+  static void EarlyZygoteLaunch();
+#endif  // defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
+
   // The client pointer must remain valid until its callback is issued.
 
  private:
   class PluginNetworkObserver;
 
   // Constructors for plugin and broker process hosts, respectively.
   // You must call Init before doing anything else.
   PpapiPluginProcessHost(const PepperPluginInfo& info,
                          const base::FilePath& profile_data_directory);
   PpapiPluginProcessHost();
@@ skipping 61 matching lines @@
  public:
   PpapiBrokerProcessHostIterator()
       : BrowserChildProcessHostTypeIterator<
           PpapiPluginProcessHost>(PROCESS_TYPE_PPAPI_BROKER) {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_