Add proto definition for boottime metrics

- Most of them are for migrating from existing historgram logging.
- Following three items added as those critical information were missing:
  SECONDARY_ZYGOTE_INIT_START, LAUNCHER_START, LAUNCHER_SHOWN

Bug: 132691841
Test: build only, follow-up CLs will be added later per each logging components

Change-Id: I26cbca3b6f2d9f990dde31ac0880272ac141ff36
Merged-In: I26cbca3b6f2d9f990dde31ac0880272ac141ff36
1 file changed
tree: 3d2e2083d091ea708b821ac83bdfd86426fa7f6e
  1. atom_field_options.proto
  2. atoms.proto