Handle uncommitted PaintController in DisplayItemClient aliveness tracking

third_party/WebKit/Source/platform/graphics/paint/PaintController.h

 // 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.
 
 #ifndef PaintController_h
 #define PaintController_h
 
 #include "platform/PlatformExport.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/IntRect.h"
@@ skipping 24 matching lines @@
 // cache invalidation, and merging.
 class PLATFORM_EXPORT PaintController {
     WTF_MAKE_NONCOPYABLE(PaintController);
     USING_FAST_MALLOC(PaintController);
 public:
     static PassOwnPtr<PaintController> create()
     {
         return adoptPtr(new PaintController());
     }
 
+    ~PaintController()
+    {
+#if CHECK_DISPLAY_ITEM_CLIENT_ALIVENESS
+        DisplayItemClient::endShouldKeepAliveAllClients(this);
+#endif
+    }
+
     void invalidateAll();
 
     // Record when paint offsets change during paint.
     void invalidatePaintOffset(const DisplayItemClient&);
 #if DCHECK_IS_ON()
     bool paintOffsetWasInvalidated(const DisplayItemClient&) const;
 #endif
 
     // These methods are called during painting.
 
@@ skipping 170 matching lines @@
     // easily find where the duplicated ids are from.
     DisplayItemIndicesByClientMap m_newDisplayItemIndicesByClient;
 #endif
 
     DisplayItemCacheGeneration m_currentCacheGeneration;
 };
 
 } // namespace blink
 
 #endif // PaintController_h