Track DisplayItemClient aliveness for each PaintController

third_party/WebKit/Source/platform/graphics/paint/PaintController.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 "platform/graphics/paint/PaintController.h"
 
 #include "platform/TraceEvent.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 #include "third_party/skia/include/core/SkPictureAnalyzer.h"
@@ skipping 49 matching lines @@
         m_newPaintChunks.decrementDisplayItemIndex();
 }
 
 void PaintController::processNewItem(DisplayItem& displayItem)
 {
     DCHECK(!m_constructionDisabled);
     DCHECK(!skippingCache() || !displayItem.isCached());
 
 #if CHECK_DISPLAY_ITEM_CLIENT_ALIVENESS
     if (!skippingCache() && (displayItem.isCacheable() || displayItem.isCached()))
-        displayItem.client().beginShouldKeepAlive();
+        displayItem.client().beginShouldKeepAlive(this);
 #endif
 
     if (displayItem.isCached())
         ++m_numCachedNewItems;
 
 #if DCHECK_IS_ON()
     // Verify noop begin/end pairs have been removed.
     if (m_newDisplayItemList.size() >= 2 && displayItem.isEnd()) {
         const auto& beginDisplayItem = m_newDisplayItemList[m_newDisplayItemList.size() - 2];
         if (beginDisplayItem.isBegin() && beginDisplayItem.getType() != DisplayItem::Subsequence && !beginDisplayItem.drawsContent())
@@ skipping 321 matching lines @@
 
 void PaintController::updateCacheGeneration()
 {
     m_currentCacheGeneration = DisplayItemCacheGeneration::next();
     for (const DisplayItem& displayItem : m_currentPaintArtifact.getDisplayItemList()) {
         if (!displayItem.isCacheable())
             continue;
         displayItem.client().setDisplayItemsCached(m_currentCacheGeneration);
     }
 #if CHECK_DISPLAY_ITEM_CLIENT_ALIVENESS
-    DisplayItemClient::endShouldKeepAliveAllClients();
+    DisplayItemClient::endShouldKeepAliveAllClients(this);
 #endif
 }
 
 #if DCHECK_IS_ON()
 
 void PaintController::checkUnderInvalidation(DisplayItemList::iterator& newIt, DisplayItemList::iterator& currentIt)
 {
     DCHECK(RuntimeEnabledFeatures::slimmingPaintUnderInvalidationCheckingEnabled());
     DCHECK(newIt->isCached());
 
@@ skipping 113 matching lines @@
 
 void PaintController::showDebugData() const
 {
     WTFLogAlways("current display item list: [%s]\n", displayItemListAsDebugString(m_currentPaintArtifact.getDisplayItemList()).utf8().data());
     WTFLogAlways("new display item list: [%s]\n", displayItemListAsDebugString(m_newDisplayItemList).utf8().data());
 }
 
 #endif // ifndef NDEBUG
 
 } // namespace blink