Add a flag to d8 to invoke weak callbacks

src/d8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_D8_H_
 #define V8_D8_H_
 
 #ifndef V8_SHARED
 #include "allocation.h"
 #include "hashmap.h"
@@ skipping 180 matching lines @@
   size_t length_;
 };
 
 
 class ShellOptions {
  public:
   ShellOptions() :
      script_executed(false),
      last_run(true),
      send_idle_notification(false),
+     invoke_weak_callbacks(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),
      icu_data_file(NULL) { }
 
   ~ShellOptions() {
     delete[] isolate_sources;
   }
 
   bool use_interactive_shell() {
     return (interactive_shell || !script_executed) && !test_shell;
   }
 
   bool script_executed;
   bool last_run;
   bool send_idle_notification;
+  bool invoke_weak_callbacks;
   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;
   const char* icu_data_file;
@@ skipping 160 matching lines @@
   static void ExternalArrayWeakCallback(Isolate* isolate,
                                         Persistent<Object>* object,
                                         uint8_t* data);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_