The Trace Event Profiling Tool (about:tracing)

When diagnosing performance problems it can be valuable to see what Chrome is doing "under the hood." One way to get a more detailed view into what's going on is to use the about:tracing tool. Tracing records activity in Chrome's processes (see multi-process architecture for more on what each process is doing). It records C++ or javascript method signatures in a hierarchical view for each thread i

[efcl]

Chrome about:tracing についての解説ページ

[yosuke_furukawa]

性能測定に使える tracing event まとめ