Docserver: Disable NaCL docs and apps samples. The bug referenced is for the
latter.

BUG=344097
TBR=yoz@chromium.org

Review URL: https://codereview.chromium.org/168153002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251470 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251470
cc: Abstract out proxy timing history

Pulling this out into a separate class lets it be reused by SingleThreadProxy.

BUG=329552

Review URL: https://codereview.chromium.org/154163005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251471 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251471