Chromium (and Google Chrome) comes with a set of built-in diagnostic tests that any user can run. These tests can help determine the root cause of the following problems.
Work in Progress : Diagnostic mode is currently only available in the tip-of-tree version of Chromium for Windows and in the developer channel version of Google Chrome for Windows. Furthermore, only a small set of diagnostic tests currently run (more are planned in the future).
Diagnostic mode is an environment that runs a set of tests before the browser starts. These tests vary in sophistication, from trivial checks that critical files exist, to more complex (and time consuming) tests that test the integrity of the key databases. Each test can pass, fail or simply be skipped if the test is not applicable. The output should be used as as a starting point for further, more specific, investigation and troubleshooting.
Diagnostic mode does not automatically send any information to Google. It is up to the user to copy the text output from running diagnostic mode that he considers appropriate and helpful for others to see. Furthermore, care has been taken to expose little to no personal information in the diagnostic output so that users can feel comfortable sharing it with internet help groups.
This shows a run where all tests passed. If a test fails it will be marked with a [FAIL] entry.