Bug: 31002801
Test: make RunSettingsRoboTests
Reads in optional metadata field for specifying the key used for an
injected preference.
Change-Id: Ief2ff10c508d42f91906b531cf34906c1c42fdd4
Ideally a page should use DashboardFragment and it doesn't need to
handle adding dynamic tiles manually. This method is only designed for
page that are not fully migrated to DashboardFragment yet.
Bug: 32623105
Test: RunSettingsRoboTests
Change-Id: I0cafcddf9a43b164daea500bade869fada5b3f4e
Insteads of inserting tile onto screen using absolute priority values,
now each page can have a placeholder preference, and at run time we will
add dynamic dashboard tiles to placeholder's place.
Bug: 32827787
Test: RunSettingsRoboTests
Change-Id: I1fe9e11dce4eb6fb4a9b56af05a2b8e5cdae00d2