Adding freelist statistics to blink gc dump provider.

Source/platform/heap/Heap.h

 /*
  * Copyright (C) 2013 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 638 matching lines @@
 public:
     FreeList();
 
     void addToFreeList(Address, size_t);
     void clear();
 
     // Returns a bucket number for inserting a FreeListEntry of a given size.
     // All FreeListEntries in the given bucket, n, have size >= 2^n.
     static int bucketIndexForSize(size_t);
 
+    // Returns true if the freelist snapshot is captured.
+    bool takeSnapshot(const String& dumpBaseName);
+
 #if ENABLE(GC_PROFILING)
     struct PerBucketFreeListStats {
         size_t entryCount;
         size_t freeSize;
 
         PerBucketFreeListStats() : entryCount(0), freeSize(0) { }
     };
 
     void getFreeSizeStats(PerBucketFreeListStats bucketStats[], size_t& totalSize) const;
 #endif
@@ skipping 17 matching lines @@
 class PLATFORM_EXPORT BaseHeap {
 public:
     BaseHeap(ThreadState*, int);
     virtual ~BaseHeap();
     void cleanupPages();
 
     void takeSnapshot(const String& dumpBaseName);
 #if ENABLE(ASSERT) || ENABLE(GC_PROFILING)
     BasePage* findPageFromAddress(Address);
 #endif
+    virtual void takeFreelistSnapshot(const String& dumpBaseName) { };
 #if ENABLE(GC_PROFILING)
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*);
     virtual void snapshotFreeList(TracedValue&) { };
 
     void countMarkedObjects(ClassAgeCountsMap&) const;
     void countObjectsToSweep(ClassAgeCountsMap&) const;
     void incrementMarkedObjectsAge();
 #endif
 
     virtual void clearFreeLists() { }
@@ skipping 39 matching lines @@
     {
         ASSERT(findPageFromAddress(address));
         ASSERT(findPageFromAddress(address + size - 1));
         m_freeList.addToFreeList(address, size);
     }
     virtual void clearFreeLists() override;
 #if ENABLE(ASSERT)
     virtual bool isConsistentForGC() override;
     bool pagesToBeSweptContains(Address);
 #endif
+    void takeFreelistSnapshot(const String& dumpBaseName) override;
 #if ENABLE(GC_PROFILING)
     void snapshotFreeList(TracedValue&) override;
 #endif
 
     Address allocateObject(size_t allocationSize, size_t gcInfoIndex);
 
     void freePage(NormalPage*);
 
     bool coalesce();
     void promptlyFreeObject(HeapObjectHeader*);
@@ skipping 624 matching lines @@
     size_t copySize = previousHeader->payloadSize();
     if (copySize > size)
         copySize = size;
     memcpy(address, previous, copySize);
     return address;
 }
 
 } // namespace blink
 
 #endif // Heap_h