title: Set width to match constraints in ConstraintLayout
body: <p>I would like to constrain a View's left and right sides to it's parent view's margins and make it fill the allotted space. However, setting width to either <code>match_parent</code> or <code>wrap_content</code> appears to produce the same result.</p>
  <p>Is there something equivalent to match_constraints (as opposed to match_parent and wrap_content)? Do <code>match_parent</code> and <code>wrap_content</code> affect the layout or are they ignored in the new constraint layout?</p>