We talked about pre-selecting first 3 google apps off this thread. That's already implemented.

CL for selecting first email here: https://crrev.com/c/1332696

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1b954e406f3886d861a064f9b78c5068e54d57d8

commit 1b954e406f3886d861a064f9b78c5068e54d57d8
Author: Hector Carmona <hcarmona@chromium.org>
Date: Wed Nov 14 02:10:15 2018

Navi: Pre-select first email provider to have a default.

Bug:  901210 ,  900377 
Change-Id: I928f6cdb1a8251131afbe2e95afe1cbca39703ea
Reviewed-on: https://chromium-review.googlesource.com/c/1332696
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607853}
[modify] https://crrev.com/1b954e406f3886d861a064f9b78c5068e54d57d8/chrome/browser/resources/welcome/onboarding_welcome/email/email_chooser.js
[modify] https://crrev.com/1b954e406f3886d861a064f9b78c5068e54d57d8/chrome/browser/resources/welcome/onboarding_welcome/email/nux_email_proxy.js
[modify] https://crrev.com/1b954e406f3886d861a064f9b78c5068e54d57d8/chrome/test/data/webui/welcome/email_chooser_test.js