[MD History] Make sidebar menu respond to spacebar.

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

Index: chrome/browser/resources/md_history/app.crisper.js
diff --git a/chrome/browser/resources/md_history/app.crisper.js b/chrome/browser/resources/md_history/app.crisper.js
index b8422e555254173f9ef6d916297f45c6bd7ad7ab..94cbc690383600134d5c89c5966468a4f9c5ff05 100644
--- a/chrome/browser/resources/md_history/app.crisper.js
+++ b/chrome/browser/resources/md_history/app.crisper.js
@@ -8533,6 +8533,37 @@ Polymer({
 });
 
 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 ]
 });
@@ -8542,6 +8573,7 @@ Polymer({
 // found in the LICENSE file.
 Polymer({
   is: 'history-side-bar',
+  behaviors: [ Polymer.IronA11yKeysBehavior ],
   properties: {
     selectedPage: {
       type: String,
@@ -8554,6 +8586,12 @@ Polymer({
       reflectToAttribute: true
     }
   },
+  keyBindings: {
+    'space:keydown': 'onSpacePressed_'
+  },
+  onSpacePressed_: function(e) {
+    e.detail.keyboardEvent.path[0].click();
+  },
   onSelectorActivate_: function() {
     this.fire('history-close-drawer');
   },