google/tracing-framework — pull request #134 by benvanik (2012-12-18 06:56:54+00:00)
Title: A bunch of breaking changes that get the file format/trace API in a good place.

* Add versioning to the trace API and file formats and support in the shim file
* Show error messages when parsing old/bad files
* Add metadata/flags to the binary file format to support future extensions
* Make the trace API event names more consistent
* Switches the argument order on events so that they are all simpler in the 99% case