Adding the main function and remaining pieces.

BUG=316397

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=235983

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=236244

Review URL: https://codereview.chromium.org/71483003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236259 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236259