Added command line debugger to D8 shell....

src/debug.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 1358 matching lines @@
                       argc,
                       argv,
                       caught_exception);
 }
 
 
 void Debugger::OnException(Handle<Object> exception, bool uncaught) {
   HandleScope scope;
 
   // Bail out based on state or if there is no listener for this event
-  if (Debug::InDebugger()) return;
+    if (Debug::InDebugger()) return;
   if (!Debugger::EventActive(v8::Exception)) return;
 
   // Bail out if exception breaks are not active
   if (uncaught) {
     // Uncaught exceptions are reported by either flags.
     if (!(Debug::break_on_uncaught_exception() ||
           Debug::break_on_exception())) return;
   } else {
     // Caught exceptions are reported is activated.
     if (!Debug::break_on_exception()) return;
@@ skipping 576 matching lines @@
 }
 
 
 void LockingMessageQueue::Clear() {
   ScopedLock sl(lock_);
   queue_.Clear();
 }
 
 
 } }  // namespace v8::internal