GitLab

We need to keep track of tabs which are being restored by session restore (instead of other mechanisms like reopening closed tabs).

This CL adds new API to SessionRestoreObserver and makes TabManager to keep track of the session-restoring tabs.

Bug: 731901
Change-Id: I0d415a689d2b8e49b58cb2af6623ad7fad7ea50a
Reviewed-on: https://chromium-review.googlesource.com/588168Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Zhen Wang <zhenw@chromium.org>
Commit-Queue: Duc Bui <ducbui@google.com>
Cr-Commit-Position: refs/heads/master@{#491395}