This patch adds a new function to load a SelfTargeting overlay to be
a ResourcesProvider instance. If the app wants to overlay itself’s
resources, the first step is to call this new function to get a
ResourcesProvider instance and then add the ResourcesProvider in a
ResourcesLoader instance.
* ResourcesProvider#loadOverlay
Test: atest \
OverlayHostTests \
OverlayDeviceTests \
SelfTargetingOverlayDeviceTests \
OverlayRemountedTest \
FrameworksServicesTests:com.android.server.om \
CtsContentTestCases:android.content.om.cts \
CtsContentTestCases:android.content.res.loader.cts \
idmap2_tests
Bug: 205919743
Change-Id: Id54da44a54ee6cbc685ad486d1bf69ef388c33ae
212f61cf58