Zygote most of the uses of the utility process on Linux

content/browser/utility_process_host.h

Index: content/browser/utility_process_host.h
diff --git a/content/browser/utility_process_host.h b/content/browser/utility_process_host.h
index de5361057282a9ca37a22328a914060dd6e2265c..9e651e4ad18c0cd3c339f1532c4eabcf35d12444 100644
--- a/content/browser/utility_process_host.h
+++ b/content/browser/utility_process_host.h
@@ -69,6 +69,9 @@ class CONTENT_EXPORT UtilityProcessHost : public BrowserChildProcessHost {
 #if defined(OS_POSIX)
   void set_env(const base::environment_vector& env) { env_ = env; }
 #endif
+#if defined(OS_LINUX)
+  void set_should_use_zygote(bool flag) { should_use_zygote_ = flag; }
+#endif
 
  protected:
   // Allow these methods to be overridden for tests.
@@ -105,6 +108,13 @@ class CONTENT_EXPORT UtilityProcessHost : public BrowserChildProcessHost {
 
   base::environment_vector env_;
 
+#if defined(OS_LINUX)

[Aaron Boodman, 2011/12/02 03:10:04]

It's a shame to require #ifdefs at all the call sites. Can we just have this
compiled in for all platforms and make it a no-op for non-linux?

Also, I think the 'should' is redundant. How about use_zygote_, or
use_linux_zygote_.

[Jorge Lucangeli Obes, 2011/12/02 18:27:16]

SGTM, will do.

+  // If the |no_sandbox_| flag is off, launch the utility process from the
+  // zygote.
+  // Can only be used for tasks that do not require FS access.
+  bool should_use_zygote_;
+#endif
+
   bool started_;
 
   DISALLOW_COPY_AND_ASSIGN(UtilityProcessHost);