[iOS] Update tab counts in tab grid page control.
This CL wires the tab grid page controls tab counts into the grid view controllers. To do this, a public |itemCount| property is added to the GridViewControllers, and the TabGridViewController updates the counts in the page control whenever an event occurs that would change the count (opening or closing a tab), and when the VC is initially set up. Bug: 804501, 804552 Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs Change-Id: I9162b45e04b102ce4c1b885356ebf3bf0873396b Reviewed-on: https://chromium-review.googlesource.com/964143Reviewed-by:edchin <edchin@chromium.org> Commit-Queue: Mark Cogan <marq@chromium.org> Cr-Commit-Position: refs/heads/master@{#543716}
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