Enable/disable LiveEdit using the (C++) debug API.

src/debug.cc

 // 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 2386 matching lines @@
   }
 }
 
 
 Debugger::Debugger(Isolate* isolate)
     : debugger_access_(isolate->debugger_access()),
       event_listener_(Handle<Object>()),
       event_listener_data_(Handle<Object>()),
       compiling_natives_(false),
       is_loading_debugger_(false),
+      is_live_edit_enabled_(true),
       never_unload_debugger_(false),
       force_debugger_active_(false),
       message_handler_(NULL),
       debugger_unload_pending_(false),
       host_dispatch_handler_(NULL),
       dispatch_handler_access_(OS::CreateMutex()),
       debug_message_dispatch_handler_(NULL),
       message_dispatch_helper_thread_(NULL),
       host_dispatch_micros_(100 * 1000),
       agent_(NULL),
@@ skipping 1238 matching lines @@
     {
       Locker locker;
       Isolate::Current()->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal