Added changes to WallpaperPreviewer for sending the current state in the
picker to WallpaperEngine

This CL aims at making changes for sending the current state in the
picker to WallpaperEngine through the dispatch wallpaper command.

Bug: b/297131459
Test: Tested by building and installing picker, and printing logs.
Change-Id: I53b2ea9ac0dbb2a79b109695c5e46249b5ac8fbc
1 file changed