The origin trial component implements browser-side support for origin trials.

This component is meant to supplement the implementation that exists in Blink, by supplying an implementation for persistent origin trials.

NOTE: The implementation is currently limited to supporting persistent origin trials, and users who need to check non-persistent origin trials in the browser should continue to use one of the methods listed in http://crbug.com/1227440#c0.

The code is implemented as a component since it needs to be shared between content embedders. It is exposed to the browser process through the content::OriginTrialsControllerDelegate interface, which can be accessed from subclasses of content::BrowserContext. This interface provides access to methods to determine if a given persistent origin trial is currently enabled for a given domain.

Since persistent origin trials are considered to be enabled until the next page load for a given domain, the enablement status is not linked to any individual browser tab, unlike regular origin trials.

TODO(crbug.com/1227440): Make non-persistent origin trials available through this component.