[automerger skipped] Add proto definition for boottime metrics am: 352c9f6fbc -s ours am: 39ae219168 -s ours am: 00e46d1b1d -s ours
am skip reason: Change-Id I26cbca3b6f2d9f990dde31ac0880272ac141ff36 with SHA-1 bc3ce006de is in history

Change-Id: I118eafce4d6798cbcab762378eb5ba6f80257705