Google is planning a transition from the root Store of the operating system to the Chrome Root Store, which is personally maintained by Google and included in Chrome. Currently, Chrome uses the root Store of the operating system to access the Certification Authority (CA). All operating systems maintain a list of root certificates that applications can use for a variety of purposes.
Browsers use these certificates to establish a secure connection to the site and to determine the authenticity of the website. One of the main reasons Google wants to transition to the Chrome Root Store is to make sure that the same root certificate is available on all platforms that are compatible with the browser.
This ensures that users have a consistent experience across platforms, that developers have a consistent understanding of Chrome’s behavior, and that Chrome will be better able to protect the security and privacy of users’ connections to the site.
The exception to this rule is Apple’s iOS operating system, which prevents Chrome and other third-party programs from using its own Root Store. Chrome will transition to its own Root Store on all support platforms for Windows, Linux, Mac OS X, Android and Chrome OS.
Google has selected a number of certification authorities to validate them using publicly available and verified information, such as information from Mozilla’s generic CA certificate database. Certification authorities that Google has not selected can request to join by following the steps outlined on this page on Google’s website.