Merge "Icon: make Icon's Bitmaps immutable" into tm-dev am: 22708575 am: afdf5cc8 am: 13dfc27e

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



Change-Id: I162904c68cd94ce9d66dde0509abbe55af631e46
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>