Add histograms for Net.WpadQuickCheck*

Add histograms to track WPAD QuickCheck success and failure time distributions.

BUG=chromium:161826
TEST=adhoc
pretty_print.py

Review URL: https://codereview.chromium.org/24739004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226059 0039d316-1c4b-4281-b951-d872f2087c98
Make --no-prompt --lib32 install lib32 support.

BUG=297984,299075
TEST=local

Review URL: https://codereview.chromium.org/24961002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226060 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226060