Convert StyleDifferenceRepaintIfTextOrColorChange to a context sensitive
property bit.

This is a preparation change for bug 358460 to simplify the
real changes for the bug.

BUG=358460
TEST=no functional change, no change of test expectations.

Review URL: https://codereview.chromium.org/229843003

git-svn-id: svn://svn.chromium.org/blink/trunk@171211 bbb929c8-8fbe-4397-9dbb-9b2b20218538