Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/platform/heap/HeapPage.h

Index: third_party/WebKit/Source/platform/heap/HeapPage.h
diff --git a/third_party/WebKit/Source/platform/heap/HeapPage.h b/third_party/WebKit/Source/platform/heap/HeapPage.h
index b35988ad1e2ba7aedcc8414a6dff58f0d6713fd4..31349423e918ca7dab80280dd3ce4597a50ee78e 100644
--- a/third_party/WebKit/Source/platform/heap/HeapPage.h
+++ b/third_party/WebKit/Source/platform/heap/HeapPage.h
@@ -683,7 +683,7 @@ protected:
     BasePage* m_firstUnsweptPage;
 
 private:
-    virtual Address lazySweepPages(size_t, size_t gcInfoIndex) = 0;
+    virtual Address lazySweepPages(size_t, size_t gcInfoIndex, GCGroup*) = 0;
 
     ThreadState* m_threadState;
 
@@ -728,7 +728,7 @@ private:
     Address outOfLineAllocate(size_t allocationSize, size_t gcInfoIndex);
     Address allocateFromFreeList(size_t, size_t gcInfoIndex);
 
-    Address lazySweepPages(size_t, size_t gcInfoIndex) override;
+    Address lazySweepPages(size_t, size_t gcInfoIndex, GCGroup*) override;
 
     Address currentAllocationPoint() const { return m_currentAllocationPoint; }
     bool hasCurrentAllocationArea() const { return currentAllocationPoint() && remainingAllocationSize(); }
@@ -750,14 +750,14 @@ private:
 class LargeObjectHeap final : public BaseHeap {
 public:
     LargeObjectHeap(ThreadState*, int);
-    Address allocateLargeObjectPage(size_t, size_t gcInfoIndex);
+    Address allocateLargeObjectPage(size_t, size_t gcInfoIndex, GCGroup*);
     void freeLargeObjectPage(LargeObjectPage*);
 #if ENABLE(ASSERT)
     bool isConsistentForGC() override { return true; }
 #endif
 private:
-    Address doAllocateLargeObjectPage(size_t, size_t gcInfoIndex);
-    Address lazySweepPages(size_t, size_t gcInfoIndex) override;
+    Address doAllocateLargeObjectPage(size_t, size_t gcInfoIndex, GCGroup*);
+    Address lazySweepPages(size_t, size_t gcInfoIndex, GCGroup*) override;
 };
 
 // Mask an address down to the enclosing oilpan heap base page.  All oilpan heap