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If I am understanding this correctly, you are using the ScriptPreprocessor to avoid setting breakpoints until the page is loaded. The current ScriptPreprocessor in Dartium is somewhat JS specific so I would like to verify that there isn't a simpler solution before we try to make it work for Dart.

Have you tried using
chrome.devtools.inspectedWindow.onResourceAdded.addListener
instead which will call back when every resource is loaded, not just JavaScript files? You could even listen for when the sourcemap resources have been loaded which is perhaps the even you really want.

Also, I'm unclear from the bug description whether you are saying that ScriptPreprocessor fails for JS loaded in Dartium or just for Dart loaded in Dartium.

This comment was originally written by devel...@gmail.com

I'm unclear from the bug description whether you are saying that ScriptPreprocessor fails for JS loaded in Dartium or just for Dart loaded in Dartium.
Browser: Dartium (31.0.1650.0)
Language of script: Dart (clock sample project).
Problem: if ScriptPreprocessor specified, there are no scriptParsed events about dart files (only dart.js will be reported — "clock" sample project).

We are using ScriptPreprocessor to append "debugger;" statement if source has source map.

1. vm event: pause (line 0)
2. vm event: scriptParsed
3. IDEA load source map and set breakpoint.
4. vm command: continue

So, user can debug file-level code. It is hack, but there is no normal way to do it.

Yes, it is not required to debug Dart in the Dartium, but user can use Dartium as regular browser (I mean — run dart app compiled to js in Dartium).

I suspect only dart.js is reported because the script is being run as pure Dart code rather than being compiled to js.

If you wish to test running dart2js within dartium, omit the "dart.js" bootstrap strip script and include a direct link to the output of running dart2js.
Alternately, you could locally modify dart.js changing the line
if (navigator.webkitStartDart) {

to
if (0) {

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This comment was originally written by devela...@gmail.com

https://code.google.com/p/chromium/issues/detail?id=438626

So, now, I don't see any possibility to set sourcemap-backed breakpoint — such breakpoints will not work on load due to obvious reasons.