[tracing] Avoid double-counting blink_gc free stats in memory-infra

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 974a86c4be59b5a4d6e7261f2fbf4825e308cad9..b4976d9868aa4ca391836cfc83d828b48f734050 100644
--- a/Source/platform/heap/Heap.h
+++ b/Source/platform/heap/Heap.h
@@ -403,7 +403,7 @@ public:
     virtual void checkAndMarkPointer(Visitor*, Address) = 0;
     virtual void markOrphaned();
 
-    virtual void takeSnapshot(String dumpBaseName, size_t pageIndex) = 0;
+    virtual void takeSnapshot(String dumpBaseName, size_t pageIndex, size_t* outFreeSize, size_t* outFreeCount) = 0;
 #if ENABLE(GC_PROFILING)
     virtual const GCInfo* findGCInfo(Address) = 0;
     virtual void snapshot(TracedValue*, ThreadState::SnapshotInfo*) = 0;
@@ -485,7 +485,7 @@ public:
     virtual void checkAndMarkPointer(Visitor*, Address) override;
     virtual void markOrphaned() override;
 
-    void takeSnapshot(String dumpBaseName, size_t pageIndex) override;
+    void takeSnapshot(String dumpBaseName, size_t pageIndex, size_t* outFreeSize, size_t* outFreeCount) override;
 #if ENABLE(GC_PROFILING)
     const GCInfo* findGCInfo(Address) override;
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override;
@@ -550,7 +550,7 @@ public:
     virtual void checkAndMarkPointer(Visitor*, Address) override;
     virtual void markOrphaned() override;
 
-    void takeSnapshot(String dumpBaseName, size_t pageIndex) override;
+    void takeSnapshot(String dumpBaseName, size_t pageIndex, size_t* outFreeSize, size_t* outFreeCount) override;
 #if ENABLE(GC_PROFILING)
     const GCInfo* findGCInfo(Address) override;
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override;