Have each SandboxedProcessLauncherDelegate maintain a zygote.

content/public/common/sandboxed_process_launcher_delegate.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_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_
 #define CONTENT_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_
 
+#include <cstddef>
+
 #include "base/environment.h"
 #include "base/files/scoped_file.h"
 #include "base/process/process.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/common/sandbox_type.h"
+#include "content/public/common/zygote_handle.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace sandbox {
 class TargetPolicy;
 }
 
 namespace content {
@@ skipping 20 matching lines @@
   // AddPolicyForSandboxedProcess.
   virtual bool DisableDefaultPolicy();
 
   // Called right before spawning the process. Returns false on failure.
   virtual bool PreSpawnTarget(sandbox::TargetPolicy* policy);
 
   // Called right after the process is launched, but before its thread is run.
   virtual void PostSpawnTarget(base::ProcessHandle process) {}
 
 #elif defined(OS_POSIX)
+#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
   // Override this to return true to use the setuid sandbox.
-  virtual bool ShouldUseZygote();
+  virtual ZygoteHandle* GetZygote();
+#endif  // !defined(OS_MACOSX) && !defined(OS_ANDROID)
 
   // Override this if the process needs a non-empty environment map.
   virtual base::EnvironmentMap GetEnvironment();
 
   // Return the file descriptor for the IPC channel.
   virtual base::ScopedFD TakeIpcFd() = 0;
 #endif
 
   // Returns the SandboxType to enforce on the process, or SANDBOX_TYPE_INVALID
   // for no sandbox policy.
   virtual SandboxType GetSandboxType();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_