Make Privet Printing work on Windows.
Printing context need to know that it's Privet local printing to generate preview.

BUG=318373

Review URL: https://codereview.chromium.org/77023003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236211 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236211