linux_aura: Implement the tree/table colors.

This asks the system for the correct themes colors and vends them to the views tree/table classes.

BUG=350144
R=msw@chromium.org

Review URL: https://codereview.chromium.org/190633007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256009 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256009