[DO NOT MERGE] Wait for preloading images to complete before inflating...

[DO NOT MERGE] Wait for preloading images to complete before inflating notifications am: 2a2da893 am: da236900 am: b218992a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21611506



Change-Id: Idc6ea5ac067981b132f821bba78b6e7e3c0c96b3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>