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Tetsui Ohkubo authoredThis adds DefaultView.VisibleRows metrics to UnifiedSystemTray. It was previously implemented in old SystemTray. PatchSet 1: Moving SystemTrayItem::UmaType to SystemTrayItemUmaType PatchSet 2: Implement the metrics in UnifiedSystemTray TEST=manual BUG=842079 Change-Id: Ied65e288147c59b6df0a8312a86e30a35fa4b953 Reviewed-on: https://chromium-review.googlesource.com/1094821 Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org> Reviewed-by: Steven Bennetts <stevenjb@chromium.org> Cr-Commit-Position: refs/heads/master@{#567108} 1d0b8c34