Implement the framework for the paint property hierarchy

third_party/WebKit/Source/platform/graphics/paint/DisplayItemList.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 DisplayItemList_h
 #define DisplayItemList_h
 
 #include "platform/PlatformExport.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/IntRect.h"
@@ skipping 42 matching lines @@
         item.setClientDebugString(originalDebugString);
 #endif
         return result;
     }
 };
 
 class PLATFORM_EXPORT DisplayItemList {
     WTF_MAKE_NONCOPYABLE(DisplayItemList);
     WTF_MAKE_FAST_ALLOCATED(DisplayItemList);
 public:
+    // TODO(pdr): With PaintArtifact, this class does not need to be heap
+    // allocated. We should refactor callers to use the constructor directly.
     static PassOwnPtr<DisplayItemList> create()
     {
         return adoptPtr(new DisplayItemList());
     }
 
     // These methods are called during paint invalidation (or paint if SlimmingPaintSynchronizedPainting is on).
     void invalidate(const DisplayItemClientWrapper&, PaintInvalidationReason, const IntRect& previousPaintInvalidationRect, const IntRect& newPaintInvalidationRect);
     void invalidateUntracked(DisplayItemClient);
     void invalidateAll();
 
@@ skipping 110 matching lines @@
     {
         ASSERT(RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled());
         return m_clientsCheckedPaintInvalidation.contains(client);
     }
     void setClientHasCheckedPaintInvalidation(DisplayItemClient client)
     {
         ASSERT(RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled());
         m_clientsCheckedPaintInvalidation.add(client);
     }
 
-protected:
     DisplayItemList()
         : m_currentDisplayItems(0)
         , m_newDisplayItems(kInitialDisplayItemsCapacity * kMaximumDisplayItemSize)
         , m_validlyCachedClientsDirty(false)
         , m_constructionDisabled(false)
         , m_skippingCacheCount(0)
         , m_numCachedItems(0)
         , m_nextScope(1) { }
 
 private:
@@ skipping 81 matching lines @@
     // the duplicated ids are from.
     DisplayItemIndicesByClientMap m_newDisplayItemIndicesByClient;
 #endif
 
     OwnPtr<Vector<String>> m_trackedPaintInvalidationObjects;
 };
 
 } // namespace blink
 
 #endif // DisplayItemList_h