Prevent spinning up a layer tree view after closing

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 368 matching lines @@
     , m_dragOperation(WebDragOperationNone)
     , m_isTransparent(false)
     , m_tabsToLinks(false)
     , m_layerTreeView(0)
     , m_rootLayer(0)
     , m_rootGraphicsLayer(0)
     , m_rootTransformLayer(0)
     , m_graphicsLayerFactory(adoptPtr(new GraphicsLayerFactoryChromium(this)))
     , m_isAcceleratedCompositingActive(false)
     , m_layerTreeViewCommitsDeferred(false)
+    , m_layerTreeViewClosed(false)
     , m_matchesHeuristicsForGpuRasterization(false)
     , m_recreatingGraphicsContext(false)
     , m_flingModifier(0)
     , m_flingSourceDevice(false)
     , m_fullscreenController(FullscreenController::create(this))
     , m_showFPSCounter(false)
     , m_showPaintRects(false)
     , m_showDebugBorders(false)
     , m_continuousPaintingEnabled(false)
     , m_showScrollBottleneckRects(false)
@@ skipping 2028 matching lines @@
 
 bool WebViewImpl::isAcceleratedCompositingActive() const
 {
     return m_isAcceleratedCompositingActive;
 }
 
 void WebViewImpl::willCloseLayerTreeView()
 {
     setIsAcceleratedCompositingActive(false);
     m_layerTreeView = 0;
+    m_layerTreeViewClosed = true;
 }
 
 void WebViewImpl::didAcquirePointerLock()
 {
     if (page())
         page()->pointerLockController().didAcquirePointerLock();
 }
 
 void WebViewImpl::didNotAcquirePointerLock()
 {
@@ skipping 1453 matching lines @@
 void WebViewImpl::setIsAcceleratedCompositingActive(bool active)
 {
     blink::Platform::current()->histogramEnumeration("GPU.setIsAcceleratedCompositingActive", active * 2 + m_isAcceleratedCompositingActive, 4);
 
     if (m_isAcceleratedCompositingActive == active)
         return;
 
     if (!m_client)
         return;
 
+    // In the middle of shutting down; don't try to spin back up a compositor.
+    if (m_layerTreeViewClosed)
+        return;
+
     if (!active) {
         m_isAcceleratedCompositingActive = false;
         if (!m_layerTreeViewCommitsDeferred
             && blink::Platform::current()->isThreadedCompositingEnabled()) {
             ASSERT(m_layerTreeView);
             // In threaded compositing mode, force compositing mode is always on so setIsAcceleratedCompositingActive(false)
             // means that we're transitioning to a new page. Suppress commits until WebKit generates invalidations so
             // we don't attempt to paint too early in the next page load.
             m_layerTreeView->setDeferCommits(true);
             m_layerTreeViewCommitsDeferred = true;
@@ skipping 239 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink