Reland of "[heap] Divide available memory upon compaction tasks"

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index 527800f4d181bec8b8726328bb0aaed86a8adb19..da75d6c983c983518e88893d6ed520db9ff76080 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -466,8 +466,6 @@ class MarkCompactCollector {
   // return true if the sweeper threads are done processing the pages.
   bool IsSweepingCompleted();
 
-  void RefillFreeList(PagedSpace* space);
-
   // Checks if sweeping is in progress right now on any space.
   bool sweeping_in_progress() { return sweeping_in_progress_; }
 
@@ -512,6 +510,20 @@ class MarkCompactCollector {
   // address range.
   void RemoveObjectSlots(Address start_slot, Address end_slot);
 
+  //
+  // Free lists filled by sweeper and consumed by corresponding spaces
+  // (including compaction spaces).
+  //
+  base::SmartPointer<FreeList>& free_list_old_space() {
+    return free_list_old_space_;
+  }
+  base::SmartPointer<FreeList>& free_list_code_space() {
+    return free_list_code_space_;
+  }
+  base::SmartPointer<FreeList>& free_list_map_space() {
+    return free_list_map_space_;
+  }
+
  private:
   class CompactionTask;
   class SweeperTask;