google/tracing-framework — pull request #54 by benvanik (2012-12-05 23:46:05+00:00)
Title: Fixing scope nesting.

This fixes out-of-order events (like gc events/etc) from nesting incorrectly, as well as some other nesting bugs such as events disappearing when panning around. It also adds the groundwork for merging sources into the same zone.
Performance impact seems negligible.