Add a trace_gc_verbose flag....

src/spaces.h

 // Copyright 2006-2008 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 375 matching lines @@
   // These are just thin wrappers around OS::Allocate and OS::Free,
   // but keep track of allocated bytes as part of heap.
   static void* AllocateRawMemory(const size_t requested,
                                  size_t* allocated,
                                  Executability executable);
   static void FreeRawMemory(void* buf, size_t length);
 
   // Returns the maximum available bytes of heaps.
   static int Available() { return capacity_ < size_ ? 0 : capacity_ - size_; }
 
+  // Returns allocated spaces in bytes.
+  static int Size() { return size_; }
+
   // Returns maximum available bytes that the old space can have.
   static int MaxAvailable() {
     return (Available() / Page::kPageSize) * Page::kObjectAreaSize;
   }
 
   // Links two pages.
   static inline void SetNextPage(Page* prev, Page* next);
 
   // Returns the next page of a given page.
   static inline Page* GetNextPage(Page* p);
@@ skipping 1386 matching lines @@
 
  private:
   LargeObjectChunk* current_;
   HeapObjectCallback size_func_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_