Oilpan: Replace EAGERLY_FINALIZE in EventTarget's hierarchy with pre-finalizers

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerRegistration.cpp

 // Copyright 2014 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 "modules/serviceworkers/ServiceWorkerRegistration.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
@@ skipping 88 matching lines @@
 
 ServiceWorkerRegistration::ServiceWorkerRegistration(ExecutionContext* executionContext, PassOwnPtr<WebServiceWorkerRegistration::Handle> handle)
     : ActiveScriptWrappable(this)
     , ActiveDOMObject(executionContext)
     , m_handle(handle)
     , m_provider(nullptr)
     , m_stopped(false)
 {
     ASSERT(m_handle);
     ASSERT(!m_handle->registration()->proxy());
+    ThreadState::current()->registerPreFinalizer(this);
 
     if (!executionContext)
         return;
     if (ServiceWorkerContainerClient* client = ServiceWorkerContainerClient::from(executionContext))
         m_provider = client->provider();
     m_handle->registration()->setProxy(this);
 }
 
 ServiceWorkerRegistration::~ServiceWorkerRegistration()
 {
 }
 
+void ServiceWorkerRegistration::dispose()
+{
+    // Promptly clears a raw reference from content/ to an on-heap object
+    // so that content/ doesn't access it in a lazy sweeping phase.
+    m_handle.clear();
+}
+
 DEFINE_TRACE(ServiceWorkerRegistration)
 {
     visitor->trace(m_installing);
     visitor->trace(m_waiting);
     visitor->trace(m_active);
     RefCountedGarbageCollectedEventTargetWithInlineData<ServiceWorkerRegistration>::trace(visitor);
     ActiveDOMObject::trace(visitor);
     Supplementable<ServiceWorkerRegistration>::trace(visitor);
 }
 
 bool ServiceWorkerRegistration::hasPendingActivity() const
 {
     return !m_stopped;
 }
 
 void ServiceWorkerRegistration::stop()
 {
     if (m_stopped)
         return;
     m_stopped = true;
     m_handle->registration()->proxyStopped();
 }
 
 } // namespace blink