Oilpan: Implement marking time estimation

Source/platform/heap/Heap.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1057 matching lines @@
     static bool s_lastGCWasConservative;
     static FreePagePool* s_freePagePool;
     static OrphanedPagePool* s_orphanedPagePool;
     static RegionTree* s_regionTree;
     static size_t s_allocatedSpace;
     static size_t s_allocatedObjectSize;
     static size_t s_markedObjectSize;
     static size_t s_externallyAllocatedBytes;
     static size_t s_externallyAllocatedBytesAlive;
     static unsigned s_requestedUrgentGC;
+    static double s_markingTimeInLastGC;
 
     friend class ThreadState;
 };
 
 // We use sized heaps for normal pages to improve memory locality.
 // It seems that the same type of objects are likely to be accessed together,
 // which means that we want to group objects by type. That's why we provide
 // dedicated heaps for popular types (e.g., Node, CSSValue), but it's not
 // practical to prepare dedicated heaps for all types. Thus we group objects
 // by their sizes, hoping that it will approximately group objects
@@ skipping 1444 matching lines @@
 template<typename T, size_t inlineCapacity>
 struct GCInfoTrait<HeapVector<T, inlineCapacity>> : public GCInfoTrait<Vector<T, inlineCapacity, HeapAllocator>> { };
 template<typename T, size_t inlineCapacity>
 struct GCInfoTrait<HeapDeque<T, inlineCapacity>> : public GCInfoTrait<Deque<T, inlineCapacity, HeapAllocator>> { };
 template<typename T, typename U, typename V>
 struct GCInfoTrait<HeapHashCountedSet<T, U, V>> : public GCInfoTrait<HashCountedSet<T, U, V, HeapAllocator>> { };
 
 } // namespace blink
 
 #endif // Heap_h