MD History: add shortcuts for search

chrome/browser/resources/md_history/app.js

Index: chrome/browser/resources/md_history/app.js
diff --git a/chrome/browser/resources/md_history/app.js b/chrome/browser/resources/md_history/app.js
index 721e621ac3142c69ce9fc27d7e5ced01f381345a..6c1a91d84a088c3c738919a88d0aa60c176fd91f 100644
--- a/chrome/browser/resources/md_history/app.js
+++ b/chrome/browser/resources/md_history/app.js
@@ -57,6 +57,10 @@ Polymer({
   /** @override */
   ready: function() {
     this.grouped_ = loadTimeData.getBoolean('groupByDomain');
+
+    cr.ui.decorate('command', cr.ui.Command);
+    document.addEventListener('canExecute', this.onCanExecute_.bind(this));
+    document.addEventListener('command', this.onCommand_.bind(this));
   },
 
   /** @private */
@@ -120,6 +124,23 @@ Polymer({
   searchDomain_: function(e) { this.$.toolbar.setSearchTerm(e.detail.domain); },
 
   /**
+   * @param {Event} e
+   * @private
+   */
+  onCanExecute_: function(e) {
+    e.canExecute = true;
+  },
+
+  /**
+   * @param {Event} e
+   * @private
+   */
+  onCommand_: function(e) {
+    if (e.command.id == 'find-command')
+      this.$.toolbar.showSearchField();
+  },
+
+  /**
    * @param {!Array<!ForeignSession>} sessionList Array of objects describing
    *     the sessions from other devices.
    * @param {boolean} isTabSyncEnabled Is tab sync enabled for this profile?