Merge "Invalidate empty pages at the start of wallpaper" into tm-dev am: 16d26136 am: dbe3989b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17756831



Change-Id: I32c5abdc97f3f661697c16a651e71381e54353d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>