Merge "Add adb shell command to set flags." into tm-dev am: 9a8e56e9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17663404



Change-Id: I5d44723ba20a599d2b210d72650487caef655328
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>