Support 'restart call frame' debug command

src/liveedit.h

-// Copyright 2010 the V8 project authors. All rights reserved.
+// 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
 //       with the distribution.
@@ skipping 104 matching lines @@
                                          Handle<JSValue> subst_function_shared);
 
   // Checks listed functions on stack and return array with corresponding
   // FunctionPatchabilityStatus statuses; extra array element may
   // contain general error message. Modifies the current stack and
   // has restart the lowest found frames and drops all other frames above
   // if possible and if do_drop is true.
   static Handle<JSArray> CheckAndDropActivations(
       Handle<JSArray> shared_info_array, bool do_drop, Zone* zone);
 
+  // Restarts the call frame and completely drops all frames above it.
+  // Return error message or NULL.
+  static const char* RestartFrame(JavaScriptFrame* frame, Zone* zone);
+
   // A copy of this is in liveedit-debugger.js.
   enum FunctionPatchabilityStatus {
     FUNCTION_AVAILABLE_FOR_PATCH = 1,
     FUNCTION_BLOCKED_ON_ACTIVE_STACK = 2,
     FUNCTION_BLOCKED_ON_OTHER_STACK = 3,
     FUNCTION_BLOCKED_UNDER_NATIVE_CODE = 4,
     FUNCTION_REPLACED_ON_ACTIVE_STACK = 5
   };
 
   // Compares 2 strings line-by-line, then token-wise and returns diff in form
@@ skipping 34 matching lines @@
   static void CalculateDifference(Input* input,
                                   Output* result_writer);
 };
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal
 
 #endif /* V*_LIVEEDIT_H_ */