Launcher changes for go/widget-size-specification

Makes sure the launcher:

1 - Send the list of actual sizes the widget in all situations.
2 - Gives the current size to the framework on inflation.

Also needed to guard the new border changes introduced in
http://ag/13532637 with the corresponding flag.

Change-Id: I2a33e9501b921f2fc393684e8ce91ee077626bf7
Test: By hand using a local widget.
Bug: 179025145