Keysets Alignment can be set to center or stretch. Stretches system-vk.


BUG=338456

Review URL: https://codereview.chromium.org/149363011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248002 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248002