Add an interface for an embedder to provide information about native

src/heap.h

 // Copyright 2010 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 1123 matching lines @@
   static inline bool ShouldBePromoted(Address old_address, int object_size);
 
   static int MaxObjectSizeInNewSpace() { return kMaxObjectSizeInNewSpace; }
 
   static void ClearJSFunctionResultCaches();
 
   static void ClearNormalizedMapCaches();
 
   static GCTracer* tracer() { return tracer_; }
 
+  static void CallGlobalGCPrologueCallback() {
+    if (global_gc_prologue_callback_ != NULL) global_gc_prologue_callback_();
+  }
+
+  static void CallGlobalGCEpilogueCallback() {
+    if (global_gc_epilogue_callback_ != NULL) global_gc_epilogue_callback_();
+  }
+
  private:
   static int reserved_semispace_size_;
   static int max_semispace_size_;
   static int initial_semispace_size_;
   static intptr_t max_old_generation_size_;
   static intptr_t max_executable_size_;
   static intptr_t code_range_size_;
 
   // For keeping track of how much data has survived
   // scavenge since last new space expansion.
@@ skipping 1055 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_