Add an API for additional profile log records

src/log.cc

 // Copyright 2011 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 1423 matching lines @@
     msg.Append(String::cast(name));
     msg.Append('"');
   } else {
     msg.AppendSymbolName(Symbol::cast(name));
   }
   msg.Append('\n');
   msg.WriteToLogFile();
 }
 
 
+void Logger::MarkEvent(char* mark) {
+  if (!log_->IsEnabled()) return;
+  Log::MessageBuilder msg(log_);
+  msg.Append("%s,%s\n", kLogEventsNames[MARK_EVENT], mark);
+  msg.WriteToLogFile();
+}
+
+
 void Logger::HeapSampleBeginEvent(const char* space, const char* kind) {
   if (!log_->IsEnabled() || !FLAG_log_gc) return;
   Log::MessageBuilder msg(log_);
   // Using non-relative system time in order to be able to synchronize with
   // external memory profiling events (e.g. DOM memory size).
   msg.Append("heap-sample-begin,\"%s\",\"%s\",%.0f\n",
              space, kind, OS::TimeCurrentMillis());
   msg.WriteToLogFile();
 }
 
@@ skipping 451 matching lines @@
   if (jit_logger_) {
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 } }  // namespace v8::internal