Docserver: Misc cleanup and debugging improvements.

TBR=yoz@chromium.org

Review URL: https://codereview.chromium.org/122733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242745 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242745