Fix the inconsistent problem while the content of textNodes is changed

third_party/WebKit/Source/core/layout/TextAutosizer.h

Index: third_party/WebKit/Source/core/layout/TextAutosizer.h
diff --git a/third_party/WebKit/Source/core/layout/TextAutosizer.h b/third_party/WebKit/Source/core/layout/TextAutosizer.h
index 35d93fcbc9c3c103440f25cbe88a7d84388262f8..84c9a0242e4967bab8e8bce58654744d22fa95e7 100644
--- a/third_party/WebKit/Source/core/layout/TextAutosizer.h
+++ b/third_party/WebKit/Source/core/layout/TextAutosizer.h
@@ -69,10 +69,11 @@ class CORE_EXPORT TextAutosizer final
 
   void updatePageInfoInAllFrames();
   void updatePageInfo();
-  void record(const LayoutBlock*);
-  void destroy(const LayoutBlock*);
+  void record(LayoutBlock*);
+  void destroy(LayoutBlock*);
 
   bool pageNeedsAutosizing() const;
+  void newNodeAdded(LayoutObject*);
 
   DECLARE_TRACE();
 
@@ -107,7 +108,8 @@ class CORE_EXPORT TextAutosizer final
   };
 
  private:
-  typedef HashSet<const LayoutBlock*> BlockSet;
+  typedef HashSet<LayoutBlock*> BlockSet;
+  typedef HashSet<const LayoutBlock*> ConstBlockSet;
 
   enum HasEnoughTextToAutosize {
     UnknownAmountOfText,
@@ -154,7 +156,7 @@ class CORE_EXPORT TextAutosizer final
           m_hasEnoughTextToAutosize(UnknownAmountOfText),
           m_multiplier(0) {}
 
-    const BlockSet* const m_roots;
+    const BlockSet* m_roots;
     HasEnoughTextToAutosize m_hasEnoughTextToAutosize;
     float m_multiplier;
   };
@@ -210,8 +212,8 @@ class CORE_EXPORT TextAutosizer final
                 "sizeof(FingerprintSourceData) must be a multiple of UChar");
 
   typedef unsigned Fingerprint;
-  typedef HashMap<Fingerprint, std::unique_ptr<Supercluster>> SuperclusterMap;
   typedef Vector<std::unique_ptr<Cluster>> ClusterStack;
+  typedef HashSet<Fingerprint> FingerprintSet;
 
   // Fingerprints are computed during style recalc, for (some subset of)
   // blocks that will become cluster roots.
@@ -219,21 +221,29 @@ class CORE_EXPORT TextAutosizer final
     DISALLOW_NEW();
 
    public:
-    void add(const LayoutObject*, Fingerprint);
-    void addTentativeClusterRoot(const LayoutBlock*, Fingerprint);
+    void add(LayoutObject*, Fingerprint);
+    void addTentativeClusterRoot(LayoutBlock*, Fingerprint);
     // Returns true if any BlockSet was modified or freed by the removal.
-    bool remove(const LayoutObject*);
+    bool remove(LayoutObject*);
     Fingerprint get(const LayoutObject*);
     BlockSet* getTentativeClusterRoots(Fingerprint);
+    Supercluster* getSupercluster(LayoutBlock*);
+    Supercluster* getSuperclusterByFingerprint(const Fingerprint);
     bool hasFingerprints() const { return !m_fingerprints.isEmpty(); }
 
    private:
     typedef HashMap<const LayoutObject*, Fingerprint> FingerprintMap;
     typedef HashMap<Fingerprint, std::unique_ptr<BlockSet>>
         ReverseFingerprintMap;
+    typedef HashMap<Fingerprint, std::unique_ptr<Supercluster>> SuperclusterMap;
 
     FingerprintMap m_fingerprints;
     ReverseFingerprintMap m_blocksForFingerprint;
+    // Make superclusters across layouts.
+    // Clusters are created and destroyed during layout. The map key is the
+    // fingerprint. Clusters whose roots share the same fingerprint use the
+    // same multiplier.
+    SuperclusterMap m_superclusters;
 #if ENABLE(ASSERT)
     void assertMapsAreConsistent();
 #endif
@@ -272,21 +282,21 @@ class CORE_EXPORT TextAutosizer final
   IntSize windowSize() const;
   void setAllTextNeedsLayout();
   void resetMultipliers();
-  BeginLayoutBehavior prepareForLayout(const LayoutBlock*);
-  void prepareClusterStack(const LayoutObject*);
+  BeginLayoutBehavior prepareForLayout(LayoutBlock*);
+  void prepareClusterStack(LayoutObject*);
   bool clusterHasEnoughTextToAutosize(
       Cluster*,
       const LayoutBlock* widthProvider = nullptr);
   bool superclusterHasEnoughTextToAutosize(
       Supercluster*,
-      const LayoutBlock* widthProvider = nullptr);
+      const LayoutBlock* widthProvider = nullptr,
+      bool skipLayoutedNodes = false);
   bool clusterWouldHaveEnoughTextToAutosize(
       const LayoutBlock* root,
       const LayoutBlock* widthProvider = nullptr);
-  Fingerprint getFingerprint(const LayoutObject*);
+  Fingerprint getFingerprint(LayoutObject*);
   Fingerprint computeFingerprint(const LayoutObject*);
-  Cluster* maybeCreateCluster(const LayoutBlock*);
-  Supercluster* getSupercluster(const LayoutBlock*);
+  Cluster* maybeCreateCluster(LayoutBlock*);
   float clusterMultiplier(Cluster*);
   float superclusterMultiplier(Cluster*);
   // A cluster's width provider is typically the deepest block containing all
@@ -294,7 +304,7 @@ class CORE_EXPORT TextAutosizer final
   // table itself for width.
   const LayoutBlock* clusterWidthProvider(const LayoutBlock*) const;
   const LayoutBlock* maxClusterWidthProvider(
-      const Supercluster*,
+      Supercluster*,
       const LayoutBlock* currentRoot) const;
   // Typically this returns a block's computed width. In the case of tables
   // layout, this width is not yet known so the fixed width is used if it's
@@ -321,22 +331,24 @@ class CORE_EXPORT TextAutosizer final
 #ifdef AUTOSIZING_DOM_DEBUG_INFO
   void writeClusterDebugInfo(Cluster*);
 #endif
+  void checkConsistent();
+  bool isParentClusterReliable(Cluster*);
+  void needCheckConsistent(LayoutBlock*);
 
   Member<const Document> m_document;
   const LayoutBlock* m_firstBlockToBeginLayout;
 #if ENABLE(ASSERT)
   // Used to ensure we don't compute properties of a block before beginLayout()
   // is called on it.
-  BlockSet m_blocksThatHaveBegunLayout;
+  ConstBlockSet m_blocksThatHaveBegunLayout;
 #endif
 
-  // Clusters are created and destroyed during layout. The map key is the
-  // cluster root. Clusters whose roots share the same fingerprint use the
-  // same multiplier.
-  SuperclusterMap m_superclusters;
   ClusterStack m_clusterStack;
   FingerprintMapper m_fingerprintMapper;
   Vector<RefPtr<ComputedStyle>> m_stylesRetainedDuringLayout;
+  // This fingerprint set keeps fingerprints of supercluster needed
+  // checkconsistent().
+  FingerprintSet m_fingerprintsNeedCheckConsistent;
   // FIXME: All frames should share the same m_pageInfo instance.
   PageInfo m_pageInfo;
   bool m_updatePageInfoDeferred;