Re-enabled printing_context_win_unittest for aura.

BUG=312495

Review URL: https://codereview.chromium.org/56553003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232611 0039d316-1c4b-4281-b951-d872f2087c98
UMA for service process events.

BUG=314284

Review URL: https://codereview.chromium.org/56723002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232613 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232613