[MD History] Make sidebar menu respond to spacebar.

chrome/browser/resources/md_history/app.crisper.js

 // Copyright 2016 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.
 function PromiseResolver() {
   this.resolve_;
   this.reject_;
   this.promise_ = new Promise(function(resolve, reject) {
     this.resolve_ = resolve;
     this.reject_ = reject;
   }.bind(this));
@@ skipping 8515 matching lines @@
     }
     this.fetchingSyncedTabs_ = true;
   },
   searchTermChanged: function(searchTerm) {
     this.clearDisplayedSyncedDevices_();
     this.updateSyncedDevices(this.sessionList);
   }
 });
 
 Polymer({
+  is: 'iron-a11y-keys',
+  behaviors: [ Polymer.IronA11yKeysBehavior ],
+  properties: {
+    target: {
+      type: Object,
+      observer: '_targetChanged'
+    },
+    keys: {
+      type: String,
+      reflectToAttribute: true,
+      observer: '_keysChanged'
+    }
+  },
+  attached: function() {
+    if (!this.target) {
+      this.target = this.parentNode;
+    }
+  },
+  _targetChanged: function(target) {
+    this.keyEventTarget = target;
+  },
+  _keysChanged: function() {
+    this.removeOwnKeyBindings();
+    this.addOwnKeyBinding(this.keys, '_fireKeysPressed');
+  },
+  _fireKeysPressed: function(event) {
+    this.fire('keys-pressed', event.detail, {});
+  }
+});
+
+Polymer({
   is: 'iron-selector',
   behaviors: [ Polymer.IronMultiSelectableBehavior ]
 });
 
 // Copyright 2016 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.
 Polymer({
   is: 'history-side-bar',
+  behaviors: [ Polymer.IronA11yKeysBehavior ],
   properties: {
     selectedPage: {
       type: String,
       notify: true
     },
     route: Object,
     showFooter: Boolean,
     drawer: {
       type: Boolean,
       reflectToAttribute: true
     }
   },
+  keyBindings: {
+    'space:keydown': 'onSpacePressed_'
+  },
+  onSpacePressed_: function(e) {
+    e.detail.keyboardEvent.path[0].click();
+  },
   onSelectorActivate_: function() {
     this.fire('history-close-drawer');
   },
   onClearBrowsingDataTap_: function(e) {
     var browserService = md_history.BrowserService.getInstance();
     browserService.recordAction('InitClearBrowsingData');
     browserService.openClearBrowsingData();
     e.preventDefault();
   },
   getQueryString_: function(route) {
@@ skipping 191 matching lines @@
 
        case HistoryRange.MONTH:
         histogramValue = HistoryPageViewHistogram.GROUPED_MONTH;
         break;
       }
       break;
     }
     md_history.BrowserService.getInstance().recordHistogram('History.HistoryPageView', histogramValue, HistoryPageViewHistogram.END);
   }
 });