Anyone can file bugs and add comments to bugs, but some things—adding labels, marking duplicates, changes status—require extra permissions.
There’s plenty you can do to help with triage without any extra permissions, but if you are doing a lot of triage you can be even more effective if you can edit bugs. Just as with becoming a committer, however, these extra permissions comes with an expectation of responsibility.
Note: The instructions below are for someone who is getting involved specifically through triage. If you need bug editing permissions for some other reason, and someone on the Chromium team can vouch for you, that person should nominate you directly via the firstname.lastname@example.org list.
First, spend at least a few weeks triaging bugs as described in the triage guidelines, doing the parts that don't require extra permissions and aiming to make significant contributions to at least 20-30 bugs. This is to demonstrate that you are committed to helping triage bugs, that you understand the triage process, and that you can work with the rest of the Chromium community.
Once you’ve done that, email a Chromium contributor who is familiar with your triage work (for instance, a developer who has worked with some of the bugs you have triaged) and ask them to review your triage contributions; include a reference to this page since they may not be familiar with the process. They should either provide feedback, or start the formal nomination process with the committers list (if they aren't sure how to evaluate, or nominate, they can email stuartmorgan@ to ask for help). As with becoming a committer, the final decision will be made by the email@example.com list.
A few things to keep in mind while you are getting started with triage, which will help ensure that the nomination process goes smoothly: