Add support for displaying distilled articles.

Adds support in the content::URLDataSource for DOM Distiller for displaying
distilled articles.

Also adds preliminary error handling.

Depends on https://codereview.chromium.org/105723002/

BUG=319881

Review URL: https://codereview.chromium.org/134873008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247645 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247645
Add kinaba@ to chrome/browser/chromeos/fileapi/OWNERS.

BUG=none
R=satorux@chromium.org

Review URL: https://codereview.chromium.org/132233057

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247646 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247646