This change introduces new metrics to discern boot time on encrypted devices:
* post_decrypt_time_elapsed
* boot_decryption_complete
* boot_complete_post_decrypt
* boot_complete_no_encryption
Bug: 27497357
Change-Id: I8d3a411029bd6a45f80589ff67c408593e133a87
boot events in the LOCAL_INIT_RC file, bootstat.rc.
This change also creates the /data/misc/bootstat dir during the
filesystem creation block in init.rc.
Bug: 21724738
Change-Id: I2ad6913c0235d5f926c6ef8b3c65d650159c6ed7