omni: emulator: add testing overlays

Change-Id: I0041605f803fd3c59b599fbef406ff6e00ff613b
diff --git a/utils/emulator/packages.mk b/utils/emulator/packages.mk
index 4ca2808..4221c5f 100644
--- a/utils/emulator/packages.mk
+++ b/utils/emulator/packages.mk
@@ -60,3 +60,6 @@
     PrimaryColdWhite \
     PrimaryWarmWhite \
     PrimaryDarkBlue
+
+PRODUCT_PACKAGES += \
+    DocumentsUITheme