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TabGridMediator relies on VisibleURL to determine if the title of a
tab should be hidden. During session restore, the restore_session.html
item is briefly the only visible item in the web view until the other
entries are restored, and it has chrome://newtab as the virtual URL.
This incorrectly causes the CreateItem() in TabGridMediator to set
|hidesTitle| to true for the grid item.

Previously visible item title was cached in WebStateImpl for a similar
reason (http://crbug.com/819606). This change combines the two use cases.


Bug: 869351
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I5391eda466ad9de26087d2d8a1e2a97a7a83f27a
Reviewed-on: https://chromium-review.googlesource.com/1157866
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581946}