Zygote most of the uses of the utility process on Linux

chrome/browser/extensions/webstore_inline_installer.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/webstore_inline_installer.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/string_util.h"
@@ skipping 55 matching lines @@
     CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     BrowserThread::PostTask(
         BrowserThread::IO,
         FROM_HERE,
         base::Bind(&SafeWebstoreResponseParser::StartWorkOnIOThread, this));
   }
 
   void StartWorkOnIOThread() {
     CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
     utility_host_ = new UtilityProcessHost(this, BrowserThread::IO);
+#if defined(OS_LINUX)
+    utility_host_->set_should_use_zygote(true);
+#endif
     utility_host_->Send(new ChromeUtilityMsg_ParseJSON(webstore_data_));
   }
 
   // Implementing pieces of the UtilityProcessHost::Client interface.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
     bool handled = true;
     IPC_BEGIN_MESSAGE_MAP(SafeWebstoreResponseParser, message)
       IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Succeeded,
                           OnJSONParseSucceeded)
       IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Failed,
@@ skipping 340 matching lines @@
   if (tab_contents()) {
     if (error.empty()) {
       delegate_->OnInlineInstallSuccess(install_id_);
     } else {
       delegate_->OnInlineInstallFailure(install_id_, error);
     }
   }
 
   Release(); // Matches the AddRef in BeginInstall.
 }