Merge "Icon: make Icon's Bitmaps immutable" into tm-dev am: 22708575 am: 3c349570 am: ac3b9d27

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17803565



Change-Id: I9b68e25ca81ea1e70b53862c2cc19d84531a4669
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>