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In "Add account" flow "Next" button is currently displayed by Gaia,
inside the webview, but "Back" button is displayed by us.
Since "GaiaActionButtons" feature in OOBE is enabled by default, we will
display native action buttons in "Add account" (Chrome OS only) and
"Add EDU account" flows too.

Add "gaia-action-buttons" component and use "setPrimaryActionLabel",
"setSecondaryActionLabel" etc. events to show navigation buttons.

Bug: 1031534
Change-Id: Ibe89fe719362e17fe32e194e5913d733e3f4995b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279817Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Anastasiia N <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795420}