Chrome Version: 57.0.2950.0
OS: MacOS x

What steps will reproduce the problem?
(0) Have the "Show all events in Timeline" DT experiment on.
(1) Visit https://www.chromestatus.com/features
(2) Take a page load timeline recording and drill into event log.
(3) Filter on "first"

What is the expected result?

See the screenshot. I would expect the first*Paint metrics be attributed to green paint operations. These metrics should also have attribute to what frame/document they came from.

It's worth noting that chromestatus.com does not use iframes but it does use HTML Imports, so there are multiple documents on the page. Could that explain why there are multiple firstContentPaints and firstPaints?

Current:

The event metrics are classified as scripting. They also do not have attribution on what caused them.
 

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	Screen Shot 2016-12-13 at 2.26.14 PM.png 113 KB View Download