Update tests for dialog/overlay services to match
changes introduced to simplify implementation of
information overlays, such as the About dialog, WTD-667.
Fill in specs for bundle platform/commonUI/dialog,
which provides the ability to show dialogs. One
of the common user interface elements being transitioned
for WTD-574.
Skeleton specs for bundle platform/commonUI/dialog,
responsible for displaying dialog overlays. Part of
ongoing transition of common user interface elements
for WTD-574.
