Zygote most of the uses of the utility process on Linux

chrome/browser/extensions/extension_updater.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/extensions/extension_updater.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 632 matching lines @@
   void ParseInSandbox(ResourceDispatcherHost* rdh) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
     // TODO(asargent) we shouldn't need to do this branch here - instead
     // UtilityProcessHost should handle it for us. (http://crbug.com/19192)
     bool use_utility_process = rdh &&
         !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
     if (use_utility_process) {
       UtilityProcessHost* host = new UtilityProcessHost(
           this, BrowserThread::UI);
+#if defined(OS_LINUX)
+      host->set_should_use_zygote(true);
+#endif
       host->Send(new ChromeUtilityMsg_ParseUpdateManifest(xml_));
     } else {
       UpdateManifest manifest;
       if (manifest.Parse(xml_)) {
         if (!BrowserThread::PostTask(
                 BrowserThread::UI, FROM_HERE,
                 base::Bind(
                     &SafeManifestParser::OnParseUpdateManifestSucceeded, this,
                     manifest.results()))) {
           NOTREACHED();
@@ skipping 581 matching lines @@
   std::set<std::string>::const_iterator i;
   for (i = ids.begin(); i != ids.end(); ++i)
     in_progress_ids_.insert(*i);
 }
 
 void ExtensionUpdater::RemoveFromInProgress(const std::set<std::string>& ids) {
   std::set<std::string>::const_iterator i;
   for (i = ids.begin(); i != ids.end(); ++i)
     in_progress_ids_.erase(*i);
 }