update security matrix in configure global security section when user authenticated.

[ludaya...@mitrai.com]

We have added google login plugin to jenkins in order to authenticate the users via google. Now we want to update the matrix(matrix-based security) in authorization in configure global security section when the user logged in via google. I couldn't find any rest api provided to update the security matrix. Or can we achieve this by changing the google login plugin? Any idea to overcome this problem or guide on where to look is much appreciated. 

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