Experiment: retire Oilpan disposal of persisted plugin widgets.

third_party/WebKit/Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 667 matching lines @@
 // Private methods -------------------------------------------------------------
 
 WebPluginContainerImpl::WebPluginContainerImpl(HTMLPlugInElement* element, WebPlugin* webPlugin)
     : LocalFrameLifecycleObserver(element->document().frame())
     , m_element(element)
     , m_webPlugin(webPlugin)
     , m_webLayer(nullptr)
     , m_touchEventRequestType(TouchEventRequestTypeNone)
     , m_wantsWheelEvents(false)
     , m_inDispose(false)
+{
 #if ENABLE(OILPAN)
-    , m_shouldDisposePlugin(false)
+    ThreadState::current()->registerPreFinalizer(this);
 #endif
-{
 }
 
 WebPluginContainerImpl::~WebPluginContainerImpl()
 {
 #if ENABLE(OILPAN)
-    if (m_shouldDisposePlugin)
-        dispose();
     // The plugin container must have been disposed of by now.
     ASSERT(!m_webPlugin);
 #else
     dispose();
 #endif
 }
 
 void WebPluginContainerImpl::dispose()
 {
     m_inDispose = true;
 
     if (m_element && m_touchEventRequestType != TouchEventRequestTypeNone && m_element->document().frameHost())
         m_element->document().frameHost()->eventHandlerRegistry().didRemoveEventHandler(*m_element, EventHandlerRegistry::TouchEvent);
 
     if (m_webPlugin) {
         RELEASE_ASSERT(!m_webPlugin->container() || m_webPlugin->container() == this);
         m_webPlugin->destroy();
         m_webPlugin = nullptr;
     }
 
     if (m_webLayer) {
         GraphicsLayer::unregisterContentsLayer(m_webLayer);
         m_webLayer = nullptr;
     }
 
     m_element = nullptr;
 }
 
-#if ENABLE(OILPAN)
-void WebPluginContainerImpl::shouldDisposePlugin()
-{
-    // If the LocalFrame is still alive, but the plugin element isn't, the
-    // LocalFrame will set m_shouldDisposePlugin via its weak pointer
-    // callback. This is a signal that the plugin container
-    // must dispose of its plugin when finalizing. The LocalFrame and
-    // all objects accessible from it can safely be accessed, but not
-    // the plugin element itself.
-    ASSERT(!m_shouldDisposePlugin);
-    m_shouldDisposePlugin = true;
-    m_element = nullptr;
-}
-#endif
-
 DEFINE_TRACE(WebPluginContainerImpl)
 {
     visitor->trace(m_element);
     LocalFrameLifecycleObserver::trace(visitor);
     PluginView::trace(visitor);
 }
 
 void WebPluginContainerImpl::handleMouseEvent(MouseEvent* event)
 {
     ASSERT(parent()->isFrameView());
@@ skipping 225 matching lines @@
         // frame view.
         computeClipRectsForPlugin(m_element, windowRect, clipRect, unobscuredRect);
     }
     getPluginOcclusions(m_element, this->parent(), frameRect(), cutOutRects);
     // Convert to the plugin position.
     for (size_t i = 0; i < cutOutRects.size(); i++)
         cutOutRects[i].move(-frameRect().x(), -frameRect().y());
 }
 
 } // namespace blinkf