Add heap log processing script originally written by Kevin.

src/log.cc

 // Copyright 2009 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 825 matching lines @@
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::HeapSampleBeginEvent(const char* space, const char* kind) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (!Log::IsEnabled() || !FLAG_log_gc) return;
   LogMessageBuilder msg;
-  msg.Append("heap-sample-begin,\"%s\",\"%s\"\n", space, kind);
+  msg.Append("heap-sample-begin,\"%s\",\"%s\"", space, kind);
+  uint32_t sec, usec;
+  if (OS::GetUserTime(&sec, &usec) != -1) {
+    msg.Append(",%d,%d", sec, usec);
+  }
+  msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::HeapSampleEndEvent(const char* space, const char* kind) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (!Log::IsEnabled() || !FLAG_log_gc) return;
   LogMessageBuilder msg;
   msg.Append("heap-sample-end,\"%s\",\"%s\"\n", space, kind);
@@ skipping 338 matching lines @@
   // Otherwise, if the sliding state window computation has not been
   // started we do it now.
   if (sliding_state_window_ == NULL) {
     sliding_state_window_ = new SlidingStateWindow();
   }
 #endif
 }
 
 
 } }  // namespace v8::internal