[webkit-dev] Monitoring JavaScript execution time

[Chuck Norris]

I'm working on a page load time monitoring tool using WebKit, and I'm  
interested in suggestions from the community about how to monitor  
JavaScript in particular.

Using WebKit, I've got really good page element monitoring through use  
of the WebFrameLoadDelegate and WebResourceLoadDelegate protocols.   
This takes care of images, script and CSS files very nicely.  But  
we're finding that ads loading with JavaScript are often a significant  
part of our page load times, and I'm trying to get some visibility  
into what's going on.  We suspect that Google Analytics code can  
occasionally take longer than usual, too.  Specifically, I'm hoping to  
be able to monitor the execution time of any JavaScript that runs at  
page load time and therefore adds to the total page load experience.

Does anyone have any suggestions for tacks I could take to solve  
this?  One thought would be to add some sort of delegate protocol for  
JavaScript that will let me monitor what's going on.  A more brute- 
force method might be to custom compile JavaScriptCore to emit the  
data I need some way.

Any suggestions, thoughts, or warnings would be welcome.

Chuck
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