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zea authored
Changes from last review: Added support for mapping a tab that had already been mapped to a different window. This can happen in Android when a placeholder tab is created from a previous window that hasn't yet closed. In addition, for testing/repro purposes this patch makes the iteration order of windows deterministic ( by going through them in SessionID order). Previous review: https://codereview.chromium.org/2683263002/ TEST=SessionsSyncMagerTest.PlaceholderConflictAcrossWindows BUG=639009 Review-Url: https://codereview.chromium.org/2712743006 Cr-Commit-Position: refs/heads/master@{#453992}
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