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Implement two types of dialogs: info and error. Info dialogs are intended
to show that an operation is in progress and cannot be interrupted. Error
dialogs are intended to show that an error occurred. The user must respond
by dismissing the dialog with any input (a swipe or keypress).
Dialogs may be initiated internally within the UI code or externally via a
named local socket. Dialogs created via socket are presumed to be info
and may not be dismissed. When the client socket is closed, the dialog
automatically dismisses.
Initial implementation shows dialogs for adb backup and restore. Future
work will show dialogs for all errors and lengthy operations.
Change-Id: Icefea12ec0fd70fb487d54aa2eb1cae9dd451355
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