further adjust bench lower bounds to cope with downside flakiness.

BUG=skia:2225
R=robertphillips@google.com
TBR=robertphillips@google.com
NOTRY=true

Author: bensong@google.com

Review URL: https://codereview.chromium.org/268643004

git-svn-id: http://skia.googlecode.com/svn/trunk@14554 2bbb7eff-a529-9590-31e7-b0007b416f81
Use a separate error parameter for lower bound.

BUG=skia:
R=robertphillips@google.com
TBR=robertphillips@google.com
NOTRY=true

Author: bensong@google.com

Review URL: https://codereview.chromium.org/268883002

git-svn-id: http://skia.googlecode.com/svn/trunk@14555 2bbb7eff-a529-9590-31e7-b0007b416f81
Fixes lower/upper typo.

BUG=skia:
R=robertphillips@google.com
TBR=robertphillips@google.com
NOTRY=true

Author: bensong@google.com

Review URL: https://codereview.chromium.org/266023005

git-svn-id: http://skia.googlecode.com/svn/trunk@14556 2bbb7eff-a529-9590-31e7-b0007b416f81
bench rebase after d06ee45
R=robertphillips@google.com
TBR=robertphillips@google.com
NOTRY=true

Author: bensong@google.com

Review URL: https://codereview.chromium.org/265163002

git-svn-id: http://skia.googlecode.com/svn/trunk@14557 2bbb7eff-a529-9590-31e7-b0007b416f81
bench rebase after d06ee45
R=robertphillips@google.com
TBR=robertphillips@google.com
NOTRY=true

Author: bensong@google.com

Review URL: https://codereview.chromium.org/264043002

git-svn-id: http://skia.googlecode.com/svn/trunk@14558 2bbb7eff-a529-9590-31e7-b0007b416f81