Santiago Etchebehere 44a2831560 [Zoom-out 1/N] Add API in WallpaperManager
Add an API in WallpaperManager (client and server) and
WallpaperService to pass a wallpaper zoom value to the
wallpaper service and engine.

Bug: 146387434
Test: (added testDeliversZoomChanged)
Test: atest WallpaperServiceTest
Change-Id: Idd9ea2aefb845ad1d330cbdd6e088b926bcfece7
2020-01-22 10:51:04 -08:00
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