hello, Jochen.
Thank you for your comments.

Yes, This CL will lose some jit code create event if snapshot is switched off.

According to your comments and my understanding, there are two other options for
vtune intialization:

1, To invoke InitializeVtuneForV8(v8::Isolate::CreateParams& params) API in
constructor of IsolateHolder.
      ( in gin/isolate_holder.cc, line 53 ).

This will introduces more code changes in gin/DEP and gin/gin.gyp so that
vtune code can be linked
      during compilation.

2, gin::Debug::SetJitCodeEventhandler(v8::JitCodeEventHandler event_handler)
is invoked to set vtune
      jit event handler and Vtune provides another API to provide the
      vTune::internal::VTUNEJITInterface::event_handler as parameter of
gin::Debug::SetJitCodeEventhandler
      function.


Which one is the best and acceptable option?

thanks,

https://codereview.chromium.org/655183002/

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