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This CL hooks up the remote tabs in the tab grid.

A user can sign in from the remote tabs page in the tab grid. The
transition animation that displays the signin interaction controller
looks bad (and we are investigating the cause). If the user is signed
in but does not have sync enabled, the user can enable sync from here.

Currently, tapping on a tab does nothing. This will be enabled in a
future CL.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ifba06919e1fb496917254a0da7e5462a4b854d79
Reviewed-on: https://chromium-review.googlesource.com/1084080
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564684}