krisgiesing 898646f0f0
Separate focus management by build owner (#13334)
Separate focus management by build owner

Currently the focus manager is held by the singleton WidgetBinding.
This change places a focus manager in each build owner object,
which allows clients to run offscreen pipelines without disturbing
focus management for the main UI.
2017-12-04 15:04:41 -08:00
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