Oilpan: Add ENABLE_LAZY_SWEEPING and ENABLE_IDLE_GC to features.gypi

Source/platform/heap/ThreadState.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 54 matching lines @@
 class Visitor;
 
 using Address = uint8_t*;
 
 using FinalizationCallback = void (*)(void*);
 using VisitorCallback = void (*)(Visitor*, void* self);
 using TraceCallback = VisitorCallback;
 using WeakCallback = VisitorCallback;
 using EphemeronCallback = VisitorCallback;
 
-#if ENABLE(OILPAN)
-#define ENABLE_LAZY_SWEEPING 1
-#else
-// TODO(haraken): Enable lazy sweeping on non-oilpan builds.
-#define ENABLE_LAZY_SWEEPING 0
-#endif
-
 // Declare that a class has a pre-finalizer function.  The function is called in
 // the object's owner thread, and can access Member<>s to other
 // garbage-collected objects allocated in the thread.  However we must not
 // allocate new garbage-collected objects, nor update Member<> and Persistent<>
 // pointers.
 //
 // This feature is similar to the HeapHashMap<WeakMember<Foo>, OwnPtr<Disposer>>
 // idiom.  The difference between this and the idiom is that pre-finalizer
 // function is called whenever an object is destructed with this feature.  The
 // HeapHashMap<WeakMember<Foo>, OwnPtr<Disposer>> idiom requires an assumption
@@ skipping 652 matching lines @@
 };
 
 template<> class ThreadStateFor<AnyThread> {
 public:
     static ThreadState* state() { return ThreadState::current(); }
 };
 
 } // namespace blink
 
 #endif // ThreadState_h