Added ChromeUtilityMsg_GetPrinterSemanticCapsAndDefaults message and handler.

BUG=317027
NOTRY=true

Review URL: https://codereview.chromium.org/155223002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249554 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249554