"Privet" Printing reads DPI for PWG raster conversion from device capabilities.

BUG=343239

Review URL: https://codereview.chromium.org/166283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251489 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251489