Add a trace_gc_verbose flag....

src/heap.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 715 matching lines @@
   static void Verify();
 
   // Report heap statistics.
   static void ReportHeapStatistics(const char* title);
   static void ReportCodeStatistics(const char* title);
 
   // Fill in bogus values in from space
   static void ZapFromSpace();
 #endif
 
+#if defined(ENABLE_LOGGING_AND_PROFILING)
+  // Print short heap statistics.
+  static void PrintShortHeapStatistics();
+#endif
+
   // Makes a new symbol object
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this function does not perform a garbage collection.
   static Object* CreateSymbol(const char* str, int length, int hash);
   static Object* CreateSymbol(String* str);
 
   // Write barrier support for address[offset] = o.
   inline static void RecordWrite(Address address, int offset);
 
@@ skipping 713 matching lines @@
   int marked_count_;
 
   // The count from the end of the previous full GC.  Will be zero if there
   // was no previous full GC.
   int previous_marked_count_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_