A simple wrapper for forms element that usually do not have placeholders or labels (e.g. <paper-radio-group>).
Example Usage:
<paper-input-wrapper label="this is the label" placeholder="my placeholder" value="{{data}}">
<paper-radio-group class="select-content" selected="{{data}}">
<paper-radio-button name="small">Small</paper-radio-button>
<paper-radio-button name="medium">This is a long medium, just to check</paper-radio-button>
<paper-radio-button name="large">Large</paper-radio-button>
</paper-radio-group>
</paper-input-wrapper>