How to add TRACE_EVENT to some pieces of source code?

[mrc3...@gmail.com]

Hi everyone

I am new to chromium. I am going to add some tracepoints to chromium's source code. I followed the instructions HERE but I cannot see the event in my trace. I added the following part to line 377 as well as doSomethingCostly()to line 389 in the file "/home/majid/Documents/chromium/src/third_party/blink/renderer/core/script/html_parser_script_runner.cc"

void doSomethingCostly() {

  TRACE_EVENT0("blink", "doSomethingCostly");

}

Moreover, I added #include "base/trace_event/trace_event.h" to the top of source file. So, whenever the HTMLParserScriptRunner::ExecuteScriptsWaitingForLoad is called, the added tracepoint should be run, but I cannot see that.

Any response would be appreciated. 

[Alex Clarke]

When you took a trace was the "blink" trace event category enabled?

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