Adding hotkey behind a commandline to allow testing the TouchView maximizing mode.

The flag and the hotkey is only temporary since there is no other way to test the TouchView functionality at this time.

BUG=337563
TEST=visual

Review URL: https://codereview.chromium.org/179063002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253369 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253369
Let navbar links height on print preview grow to accomodate content.

BUG=306025
NOTRY=true

Review URL: https://codereview.chromium.org/180803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253370 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253370