[heap] Untangle Marking and friends from heap dependencies.

src/heap/incremental-marking.h

Index: src/heap/incremental-marking.h
diff --git a/src/heap/incremental-marking.h b/src/heap/incremental-marking.h
index 5f5a1deae781467544cc5d2db744ba433028a4fb..7ecbf3581e1dc8b7b2d09cd7a01af2b05c69a9e7 100644
--- a/src/heap/incremental-marking.h
+++ b/src/heap/incremental-marking.h
@@ -9,6 +9,7 @@
 #include "src/execution.h"
 #include "src/heap/heap.h"
 #include "src/heap/incremental-marking-job.h"
+#include "src/heap/mark-compact.h"
 #include "src/heap/spaces.h"
 #include "src/objects.h"
 
@@ -205,6 +206,25 @@ class IncrementalMarking {
 
   static void MarkObject(Heap* heap, HeapObject* object);
 
+  static void TransferMark(Heap* heap, Address old_start, Address new_start);
+
+  // Returns true if the transferred color is black.
+  INLINE(static bool TransferColor(HeapObject* from, HeapObject* to)) {
+    if (Page::FromAddress(to->address())->IsFlagSet(Page::BLACK_PAGE))
+      return true;
+    MarkBit from_mark_bit = ObjectMarking::MarkBitFrom(from);
+    MarkBit to_mark_bit = ObjectMarking::MarkBitFrom(to);
+    DCHECK(Marking::IsWhite(to_mark_bit));
+    if (from_mark_bit.Get()) {
+      to_mark_bit.Set();
+      if (from_mark_bit.Next().Get()) {
+        to_mark_bit.Next().Set();
+        return true;
+      }
+    }
+    return false;
+  }
+
   void IterateBlackObject(HeapObject* object);
 
   Heap* heap() const { return heap_; }