Added Prepare Step to Bisect Command
Added Prepare Step to Bisect Command


BUG=
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/12340084

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@184750 0039d316-1c4b-4281-b951-d872f2087c98

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