Add tool to graph AMS process dependencies.

Change-Id: I93adb99b43bd7b879d69c180bd488925bf320a01
Test: m graph_ams; adb shell dumpsys activity --proto > activity.bin; graph_ams activity.bin > activity.dot; dot -Tpdf activity.dot -o activity.pdf
Bug: 419577469
Flag: EXEMPT build infra and tools
3 files changed