[tracing] Adding class-wise memory statistics to blink gc memory dumps

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 ea3aa4685c6c11556a45cbf20d024f42c36b942c..7cedef1c99621ec10c056acfdb2edfb7192f2f80 100644
--- a/Source/platform/heap/Heap.h
+++ b/Source/platform/heap/Heap.h
@@ -95,6 +95,7 @@ class FreePagePool;
 class NormalPageHeap;
 class OrphanedPagePool;
 class PageMemory;
+class WebProcessMemoryDump;
 
 #if ENABLE(GC_PROFILING)
 class TracedValue;
@@ -401,6 +402,8 @@ public:
     // the stack.
     virtual void checkAndMarkPointer(Visitor*, Address) = 0;
     virtual void markOrphaned();
+
+    virtual void takeSnapshot(String dumpName, size_t pageIndex, ThreadState::GCSnapshotInfo&) = 0;
 #if ENABLE(GC_PROFILING)
     virtual const GCInfo* findGCInfo(Address) = 0;
     virtual void snapshot(TracedValue*, ThreadState::SnapshotInfo*) = 0;
@@ -481,6 +484,8 @@ public:
 #endif
     virtual void checkAndMarkPointer(Visitor*, Address) override;
     virtual void markOrphaned() override;
+
+    void takeSnapshot(String dumpBaseName, size_t pageIndex, ThreadState::GCSnapshotInfo&) override;
 #if ENABLE(GC_PROFILING)
     const GCInfo* findGCInfo(Address) override;
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override;
@@ -545,6 +550,7 @@ public:
     virtual void checkAndMarkPointer(Visitor*, Address) override;
     virtual void markOrphaned() override;
 
+    void takeSnapshot(String dumpBaseName, size_t pageIndex, ThreadState::GCSnapshotInfo&) override;
 #if ENABLE(GC_PROFILING)
     const GCInfo* findGCInfo(Address) override;
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override;
@@ -650,6 +656,7 @@ public:
     // All FreeListEntries in the given bucket, n, have size >= 2^n.
     static int bucketIndexForSize(size_t);
 
+    void takeSnapshot(const String& dumpBaseName);
 #if ENABLE(GC_PROFILING)
     struct PerBucketFreeListStats {
         size_t entryCount;
@@ -683,10 +690,11 @@ public:
     virtual ~BaseHeap();
     void cleanupPages();
 
-    void takeSnapshot(const String& dumpBaseName);
+    void takeSnapshot(const String& dumpBaseName, ThreadState::GCSnapshotInfo&);
 #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&) { };
@@ -746,6 +754,7 @@ public:
     virtual bool isConsistentForGC() override;
     bool pagesToBeSweptContains(Address);
 #endif
+    void takeFreelistSnapshot(const String& dumpBaseName) override;
 #if ENABLE(GC_PROFILING)
     void snapshotFreeList(TracedValue&) override;
 #endif