Use mock ArrayBuffer allocator to avoid really allocating 1Gb.

src/d8.h

 // Copyright 2012 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 215 matching lines @@
 #endif  // V8_SHARED
      script_executed(false),
      last_run(true),
      send_idle_notification(false),
      stress_opt(false),
      stress_deopt(false),
      interactive_shell(false),
      test_shell(false),
      dump_heap_constants(false),
      expected_to_throw(false),
+     mock_arraybuffer_allocator(false),
      num_isolates(1),
      isolate_sources(NULL) { }
 
   ~ShellOptions() {
 #ifndef V8_SHARED
     delete[] parallel_files;
 #endif  // V8_SHARED
     delete[] isolate_sources;
   }
 
 #ifndef V8_SHARED
   bool use_preemption;
   int preemption_interval;
   int num_parallel_files;
   char** parallel_files;
 #endif  // V8_SHARED
   bool script_executed;
   bool last_run;
   bool send_idle_notification;
   bool stress_opt;
   bool stress_deopt;
   bool interactive_shell;
   bool test_shell;
   bool dump_heap_constants;
   bool expected_to_throw;
+  bool mock_arraybuffer_allocator;
   int num_isolates;
   SourceGroup* isolate_sources;
 };
 
 #ifdef V8_SHARED
 class Shell {
 #else
 class Shell : public i::AllStatic {
 #endif  // V8_SHARED
 
@@ skipping 154 matching lines @@
   static void ExternalArrayWeakCallback(Isolate* isolate,
                                         Persistent<Object>* object,
                                         uint8_t* data);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_