Roll third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tab-extracted.js

 Polymer({
       is: 'paper-tab',
 
       behaviors: [
         Polymer.IronControlState,
         Polymer.IronButtonState,
         Polymer.PaperRippleBehavior
       ],
 
+      properties: {
+
+        /**
+         * If true, the tab will forward keyboard clicks (enter/space) to
+         * the first anchor element found in its descendants
+         */
+        link: {
+          type: Boolean,
+          value: false,
+          reflectToAttribute: true
+        }
+
+      },
+
       hostAttributes: {
         role: 'tab'
       },
 
       listeners: {
-        down: '_updateNoink'
+        down: '_updateNoink',
+        tap: '_onTap'
       },
 
       attached: function() {
         this._updateNoink();
       },
 
       get _parentNoink () {
         var parent = Polymer.dom(this).parentNode;
         return !!parent && !!parent.noink;
       },
 
       _updateNoink: function() {
         this.noink = !!this.noink || !!this._parentNoink;
+      },
+
+      _onTap: function(event) {
+        if (this.link) {
+          var anchor = this.queryEffectiveChildren('a');
+
+          if (!anchor) {
+            return;
+          }
+
+          // Don't get stuck in a loop delegating
+          // the listener from the child anchor
+          if (event.target === anchor) {
+            return;
+          }
+
+          anchor.click();
+        }
       }
+
     });