Zygote most of the uses of the utility process on Linux

content/browser/in_process_webkit/indexed_db_key_utility_client.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 "content/browser/in_process_webkit/indexed_db_key_utility_client.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/browser/utility_process_host.h"
@@ skipping 258 matching lines @@
         BrowserThread::IO, FROM_HERE,
         base::Bind(&KeyUtilityClientImpl::StartUtilityProcessInternal, this));
     return;
   }
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(state_ == STATE_UNINITIALIZED);
 
   client_ = new KeyUtilityClientImpl::Client(this);
   utility_process_host_ = new UtilityProcessHost(
       client_.get(), BrowserThread::IO);
+#if defined(OS_LINUX)
+  utility_process_host_->set_should_use_zygote(true);
+#endif
   utility_process_host_->StartBatchMode();
   state_ = STATE_INITIALIZED;
   waitable_event_.Signal();
 }
 
 void KeyUtilityClientImpl::EndUtilityProcessInternal() {
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&KeyUtilityClientImpl::EndUtilityProcessInternal, this));
@@ skipping 97 matching lines @@
 void KeyUtilityClientImpl::Client::OnInjectIDBKeyFinished(
     const content::SerializedScriptValue& value) {
   parent_->SetValueAfterInjection(value);
   parent_->FinishInjectingKey();
 }
 
 void KeyUtilityClientImpl::Client::OnIDBKeysFromValuesAndKeyPathFailed(
     int id) {
   parent_->FinishCreatingKeys();
 }