build_image: set verity_depth default to 3
This is in preparation for moving to a level 0 count of 1.
Seems to give about 200ms boot speedup.
Before(verity_depth = 1):
seconds_power_on_to_login 7.73
seconds_power_on_to_login{1} 7.97
seconds_power_on_to_login{2} 7.8
seconds_power_on_to_login{3} 7.86
seconds_power_on_to_login{4} 7.84
seconds_power_on_to_login{5} 7.81
seconds_power_on_to_login{6} 7.85
seconds_power_on_to_login{7} 7.85
seconds_power_on_to_login{8} 7.85
seconds_power_on_to_login{9} 7.82
After(verity_depth = 3)
seconds_power_on_to_login 7.57
seconds_power_on_to_login{1} 7.89
seconds_power_on_to_login{2} 7.54
seconds_power_on_to_login{3} 7.56
seconds_power_on_to_login{4} 7.53
seconds_power_on_to_login{5} 7.56
seconds_power_on_to_login{6} 7.79
seconds_power_on_to_login{7} 7.58
seconds_power_on_to_login{8} 7.56
seconds_power_on_to_login{9} 7.62
BUG=chromium-os:9752
TEST=platform_BootPerfServer
Change-Id: I7f6e39ad2ed2c2e8ebc463860578c3f97b8295a2
R=wad@chromium.org,jrbarnette@chromium.org
Review URL: http://codereview.chromium.org/6759016
1 file changed
