MD Settings: Make Enter key submit changes in the Internet section

chrome/browser/resources/settings/internet_page/network_proxy.html

 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_onc_types.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_network_behavior.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_network_indicator.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/md_select_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/iron-a11y-keys/iron-a11y-keys.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input-container.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="/controls/extension_controlled_indicator.html">
 <link rel="import" href="/controls/settings_toggle_button.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/prefs/prefs_behavior.html">
 <link rel="import" href="/settings_vars_css.html">
 <link rel="import" href="internet_shared_css.html">
@@ skipping 107 matching lines @@
     <div id="proxyDiv" class="settings-box continuation single-column indent"
         hidden$="[[!matches_(proxy_.Type, ProxySettingsType_.MANUAL)]]">
       <div class="flex layout horizontal">
         <div class="flex">$i18n{networkProxyUseSame}</div>
         <paper-toggle-button checked="{{useSameProxy_}}"
             disabled="[[!isEditable_('Type', networkProperties, editable,
                 useSharedProxies_)]]">
         </paper-toggle-button>
       </div>
       <div hidden$="[[!useSameProxy_]]" class="layout vertical">
-        <network-proxy-input 
+        <network-proxy-input
             on-proxy-change="onProxyInputChange_"
             editable="[[isEditable_('Manual.HTTPProxy.Host', networkProperties,
                 editable, useSharedProxies_)]]"
             value="{{proxy_.Manual.HTTPProxy}}"
             label="$i18n{networkProxy}">
         </network-proxy-input>
       </div>
       <div hidden$="[[useSameProxy_]]" class="layout vertical">
         <network-proxy-input
             on-proxy-change="onProxyInputChange_"
@@ skipping 28 matching lines @@
       <div id="exceptionsDiv"
           hidden="[[!isEditable_('Type', networkProperties, editable,
               useSharedProxies_)]]">
         <div>$i18n{networkProxyExceptionList}</div>
         <network-proxy-exclusions on-proxy-change="onProxyExclusionsChange_"
             exclusions="{{proxy_.ExcludeDomains}}">
         </network-proxy-exclusions>
         <div class="layout horizontal">
           <paper-input-container no-label-float class="flex">
             <input id="proxyExclusion" is="iron-input">
+            <iron-a11y-keys keys="enter"
+                on-keys-pressed="onAddProxyExclusionTap_">
+            </iron-a11y-keys>
           </paper-input-container>
           <paper-button on-tap="onAddProxyExclusionTap_">
             $i18n{networkProxyAddException}
           </paper-button>
         </div>
       </div>
 
       <paper-button id="saveManualProxy"
           on-tap="onSaveProxyTap_" class="action-button"
           disabled="[[!isSaveManualProxyEnabled_(networkProperties,
@@ skipping 14 matching lines @@
         </paper-button>
         <paper-button class="action-button"
             on-tap="onAllowSharedDialogConfirm_">
           $i18n{confirm}
         </paper-button>
       </div>
     </dialog>
   </template>
   <script src="network_proxy.js"></script>
 </dom-module>