In attempt to speed up Android Boot time we need better understand parts
that are taking long time during boot phase. SystemServer accounts to
~30-40% of boot time, so profiling and monitoring it should help
identify problematic parts.
Along with systrace logcat messages were added to simplify on the glance
check of boot process timing without the need to collect systrace.
Change-Id: Ice203eb3e6aa662d1a7cefc8bcd76f372347f4a0
4887e67c0b