Roll third_party/polymer.

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

Index: third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs-extracted.js
diff --git a/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs-extracted.js b/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs-extracted.js
index 9711b0ef6dac2e31512c6f507664682f3eb412d4..c62ca49ae69f3470d65a0b1629abba7aee349068 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs-extracted.js
+++ b/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs-extracted.js
@@ -71,6 +71,25 @@ Polymer({
           value: 'paper-tab'
         },
 
+        /**
+         * If true, tabs are automatically selected when focused using the
+         * keyboard.
+         */
+        autoselect: {
+          type: Boolean,
+          value: false
+        },
+
+        /**
+         * The delay (in milliseconds) between when the user stops interacting
+         * with the tabs through the keyboard and when the focused item is
+         * automatically selected (if `autoselect` is true).
+         */
+        autoselectDelay: {
+          type: Number,
+          value: 0
+        },
+
         _step: {
           type: Number,
           value: 10
@@ -107,14 +126,26 @@ Polymer({
         'iron-deselect': '_onIronDeselect'
       },
 
+      keyBindings: {
+        'left:keyup right:keyup': '_onArrowKeyup'
+      },
+
       created: function() {
         this._holdJob = null;
+        this._pendingActivationItem = undefined;
+        this._pendingActivationTimeout = undefined;
+        this._bindDelayedActivationHandler = this._delayedActivationHandler.bind(this);
+        this.addEventListener('blur', this._onBlurCapture.bind(this), true);
       },
 
       ready: function() {
         this.setScrollDirection('y', this.$.tabsContainer);
       },
 
+      detached: function() {
+        this._cancelPendingActivation();
+      },
+
       _noinkChanged: function(noink) {
         var childTabs = Polymer.dom(this).querySelectorAll('paper-tab');
         childTabs.forEach(noink ? this._setNoinkAttribute : this._removeNoinkAttribute);
@@ -176,6 +207,62 @@ Polymer({
         }, 1);
       },
 
+      _activateHandler: function() {
+        // Cancel item activations scheduled by keyboard events when any other
+        // action causes an item to be activated (e.g. clicks).
+        this._cancelPendingActivation();
+
+        Polymer.IronMenuBehaviorImpl._activateHandler.apply(this, arguments);
+      },
+
+      /**
+       * Activates an item after a delay (in milliseconds).
+       */
+      _scheduleActivation: function(item, delay) {
+        this._pendingActivationItem = item;
+        this._pendingActivationTimeout = this.async(
+            this._bindDelayedActivationHandler, delay);
+      },
+
+      /**
+       * Activates the last item given to `_scheduleActivation`.
+       */
+      _delayedActivationHandler: function() {
+        var item = this._pendingActivationItem;
+        this._pendingActivationItem = undefined;
+        this._pendingActivationTimeout = undefined;
+        item.fire(this.activateEvent, null, {
+          bubbles: true,
+          cancelable: true
+        });
+      },
+
+      /**
+       * Cancels a previously scheduled item activation made with
+       * `_scheduleActivation`.
+       */
+      _cancelPendingActivation: function() {
+        if (this._pendingActivationTimeout !== undefined) {
+          this.cancelAsync(this._pendingActivationTimeout);
+          this._pendingActivationItem = undefined;
+          this._pendingActivationTimeout = undefined;
+        }
+      },
+
+      _onArrowKeyup: function(event) {
+        if (this.autoselect) {
+          this._scheduleActivation(this.focusedItem, this.autoselectDelay);
+        }
+      },
+
+      _onBlurCapture: function(event) {
+        // Cancel a scheduled item activation (if any) when that item is
+        // blurred.
+        if (event.target === this._pendingActivationItem) {
+          this._cancelPendingActivation();
+        }
+      },
+
       get _tabContainerScrollSize () {
         return Math.max(
           0,
@@ -184,7 +271,6 @@ Polymer({
         );
       },
 
-
       _scroll: function(e, detail) {
         if (!this.scrollable) {
           return;