Add poultney, pomini, santie to WallpaperManager(Service) OWNERS

Currently WallpaperManager has only two owners. This CL adds three folks working actively on the area.

Bug: N/A
Test: N/A, only a change in an OWNERS file
Ignore-AOSP-First: team is working on qpr/master
Change-Id: I504d90aaaf4ddf20a491dddbfe239215584fbaac
diff --git a/core/java/android/service/wallpaper/OWNERS b/core/java/android/service/wallpaper/OWNERS
index 756eef8..71bd190 100644
--- a/core/java/android/service/wallpaper/OWNERS
+++ b/core/java/android/service/wallpaper/OWNERS
@@ -3,3 +3,6 @@
 dupin@google.com
 dsandler@android.com
 dsandler@google.com
+pomini@google.com
+poultney@google.com
+santie@google.com