Push version 2.5.7 to trunk....

src/bootstrapper.cc

 // 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 21 matching lines @@
 #include "bootstrapper.h"
 #include "compiler.h"
 #include "debug.h"
 #include "execution.h"
 #include "global-handles.h"
 #include "macro-assembler.h"
 #include "natives.h"
 #include "objects-visiting.h"
 #include "snapshot.h"
 #include "stub-cache.h"
+#include "extensions/externalize-string-extension.h"
+#include "extensions/gc-extension.h"
 
 namespace v8 {
 namespace internal {
 
 // A SourceCodeCache uses a FixedArray to store pairs of
 // (AsciiString*, JSFunction*), mapping names of native code files
 // (runtime.js, etc.) to precompiled functions. Instead of mapping
 // names to functions it might make sense to let the JS2C tool
 // generate an index for each native JS file.
 class SourceCodeCache BASE_EMBEDDED {
@@ skipping 78 matching lines @@
       Heap::natives_source_cache()->set(index, *source_code);
     }
   }
   Handle<Object> cached_source(Heap::natives_source_cache()->get(index));
   return Handle<String>::cast(cached_source);
 }
 
 
 void Bootstrapper::Initialize(bool create_heap_objects) {
   extensions_cache.Initialize(create_heap_objects);
+  GCExtension::Register();
+  ExternalizeStringExtension::Register();
 }
 
 
 char* Bootstrapper::AllocateAutoDeletedArray(int bytes) {
   char* memory = new char[bytes];
   if (memory != NULL) {
     if (delete_these_arrays_on_tear_down == NULL) {
       delete_these_arrays_on_tear_down = new List<char*>(2);
     }
     delete_these_arrays_on_tear_down->Add(memory);
@@ skipping 1714 matching lines @@
 }
 
 
 // Restore statics that are thread local.
 char* BootstrapperActive::RestoreState(char* from) {
   nesting_ = *reinterpret_cast<int*>(from);
   return from + sizeof(nesting_);
 }
 
 } }  // namespace v8::internal