Currently, scripts are attributed to FrameBlameContexts in V8ScriptRunner::callFunction. This has at least two defects:

1. Microtasks are attributed incorrectly (found by yhirano@). v8::internal::Isolate::runMicrotasks runs all microtasks accumulated in the same v8::Isolate, each of which may have a different v8::Context. The task queue or call site of runMicrotasks cannot provide enough information for correct attribution of all microtasks.

2. Script run on non-main threads (e.g. ServiceWorker) cannot be attributed.

ps. Please help me add some components and labels because I don't know what should be applied here...

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Is this valid? if not, please close this issue.

The NextAction date has arrived: 2017-12-13

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot