Add network proxy input to md-settings internet details

ui/webui/resources/cr_elements/v1_0/cr_input/cr_input.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * `cr-input` is a single-line text field for user input. It is a convenience
  * element wrapping `paper-input`.
  *
  * Example:
@@ skipping 10 matching lines @@
     /**
      * The label for this input. It normally appears as grey text inside
      * the text input and disappears once the user enters text.
      */
     label: {
       type: String,
       value: ''
     },
 
     /**
+     * Propagate the no-label-float property.
+     */
+    noLabelFloat: {
+      type: Boolean,
+      value: false
+    },
+
+    /**
      * Set to true to mark the input as required.
      */
     required: {
       type: Boolean,
       value: false
     },
 
     /**
      * Set to true to disable editing the input.
      */
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    */
   focus: function() {
     this.$.input.focus();
   },
 
   /** @override */
   ready: function() {
     this.$.events.forward(this.$.input, ['change']);
   },
 });