Add output to show when sandbox is enabled/disabled.
Add output to show when sandbox is enabled/disabled.

TBR=szager@chromium.org
BUG=126163


Review URL: https://chromiumcodereview.appspot.com/10409040

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@137973 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build