Have each SandboxedProcessLauncherDelegate maintain a zygote.

content/browser/child_process_launcher.h

Index: content/browser/child_process_launcher.h
diff --git a/content/browser/child_process_launcher.h b/content/browser/child_process_launcher.h
index c4f63210af106d6db198f67d79aae355b7138d36..9233f43c5b5a88161d30be8b6b56c422625ffd23 100644
--- a/content/browser/child_process_launcher.h
+++ b/content/browser/child_process_launcher.h
@@ -15,13 +15,13 @@
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/common/sandboxed_process_launcher_delegate.h"
 
 namespace base {
 class CommandLine;
 }
 
 namespace content {
-class SandboxedProcessLauncherDelegate;
 
 // Launches a process asynchronously and notifies the client of the process
 // handle when it's available.  It's used to avoid blocking the calling thread
@@ -95,14 +95,14 @@ class CONTENT_EXPORT ChildProcessLauncher : public base::NonThreadSafe {
   // client went away.
   static void DidLaunch(base::WeakPtr<ChildProcessLauncher> instance,
                         bool terminate_on_shutdown,
-                        bool zygote,
+                        ZygoteHandle zygote,
 #if defined(OS_ANDROID)
                         base::ScopedFD ipcfd,
 #endif
                         base::Process process);
 
   // Notifies the client about the result of the operation.
-  void Notify(bool zygote,
+  void Notify(ZygoteHandle zygote,
 #if defined(OS_ANDROID)
               base::ScopedFD ipcfd,
 #endif
@@ -122,7 +122,7 @@ class CONTENT_EXPORT ChildProcessLauncher : public base::NonThreadSafe {
   base::Process process_;
   base::TerminationStatus termination_status_;
   int exit_code_;
-  bool zygote_;
+  ZygoteHandle zygote_;
   bool starting_;
   // Controls whether the child process should be terminated on browser
   // shutdown. Default behavior is to terminate the child.