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Pass the current tab as the opener when opening a new tab.
This allow selection the previous current tab when the
tab is closed via "pull-to-close" action or via the new
"close" action in the UI refresh.

The current tab is passed when tab is opened via ([*]
denotes that this behaviour is added by this CL):
- open tab in background
- "New Tab" menu action [*]
- captive portal detection [*]
- search by image [*]

Bug: 661988
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iecf41a8c0b3cfe465b3ff95a1061c97739b4ed79
Reviewed-on: https://chromium-review.googlesource.com/1068680Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561427}