Scrims should be grey when in-app

Bug: 38164389
Test: runtest -x colorextraction/tests/src/com/google/android/colorextraction/ColorExtractorTest.java
Test: runtest -x tests/src/com/android/systemui/colorextraction/SysuiColorExtractorTests.java
Change-Id: Ifcc04a8562e46b4f65bce0470ccd6c02dffcf377
diff --git a/Android.mk b/Android.mk
index 00dc784..66c5987 100644
--- a/Android.mk
+++ b/Android.mk
@@ -357,6 +357,7 @@
 	core/java/android/view/IPinnedStackController.aidl \
 	core/java/android/view/IPinnedStackListener.aidl \
 	core/java/android/view/IRotationWatcher.aidl \
+	core/java/android/view/IWallpaperVisibilityListener.aidl \
 	core/java/android/view/IWindow.aidl \
 	core/java/android/view/IWindowFocusObserver.aidl \
 	core/java/android/view/IWindowId.aidl \