[inspector] introduced memory size limit for console message storage

src/debug/debug-interface.h

 // Copyright 2016 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_DEBUG_DEBUG_INTERFACE_H_
 #define V8_DEBUG_DEBUG_INTERFACE_H_
 
 #include <functional>
 
 #include "include/v8-debug.h"
@@ skipping 155 matching lines @@
                                     const debug::Location& end) {
     return false;
   }
 };
 
 void SetDebugDelegate(Isolate* isolate, DebugDelegate* listener);
 
 void ResetBlackboxedStateCache(Isolate* isolate,
                                v8::Local<debug::Script> script);
 
+int EstimatedValueSize(Isolate* isolate, v8::Local<v8::Value> value);
+
 }  // namespace debug
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_INTERFACE_H_