Oilpan: Add free list profiler.

Source/platform/heap/Heap.h

Index: Source/platform/heap/Heap.h
diff --git a/Source/platform/heap/Heap.h b/Source/platform/heap/Heap.h
index ca2f6c48674398d5efb4b2ac8ddead590f5b7be1..0d12239dab255ca082af69b896fb1c3409e37bac 100644
--- a/Source/platform/heap/Heap.h
+++ b/Source/platform/heap/Heap.h
@@ -705,6 +705,10 @@ public:
     // All FreeListEntries in the given bucket, n, have size >= 2^n.
     static int bucketIndexForSize(size_t);
 
+#if ENABLE(GC_PROFILING)
+    void countBucketSizes(size_t sizes[], size_t totalSizes[], size_t& freeSize) const;
+#endif
+
 private:
     int m_biggestFreeListIndex;
 
@@ -772,6 +776,10 @@ public:
     void shrinkObject(HeapObjectHeader*, size_t);
     void decreasePromptlyFreedSize(size_t size) { m_promptlyFreedSize -= size; }
 
+#if ENABLE(GC_PROFILING)
+    void snapshotFreeList(TracedValue&);
+#endif
+
 private:
     Address outOfLineAllocate(size_t allocationSize, size_t gcInfoIndex);
     Address currentAllocationPoint() const { return m_currentAllocationPoint; }
@@ -814,6 +822,14 @@ private:
 
     // The size of promptly freed objects in the heap.
     size_t m_promptlyFreedSize;
+
+#if ENABLE(GC_PROFILING)
+    double m_totalAllocationSize;
+    size_t m_allocationCount;
+    size_t m_inlineAllocationCount;
+    size_t m_allocationPointSizeSum;
+    size_t m_setAllocationPointCount;
+#endif
 };
 
 // Mask an address down to the enclosing oilpan heap base page.  All oilpan heap