[MD History] Add URL parameter for search.

chrome/browser/resources/md_history/side_bar.js

Index: chrome/browser/resources/md_history/side_bar.js
diff --git a/chrome/browser/resources/md_history/side_bar.js b/chrome/browser/resources/md_history/side_bar.js
index 1195d221193d1d09f909d6215ddc5cf73c24998f..7e027f074ca5400a35cbe7bd06e0a4edfd33f861 100644
--- a/chrome/browser/resources/md_history/side_bar.js
+++ b/chrome/browser/resources/md_history/side_bar.js
@@ -10,6 +10,8 @@ Polymer({
       type: String,
       notify: true
     },
+
+    route: Object,
   },
 
   toggle: function() {
@@ -40,4 +42,12 @@ Polymer({
     md_history.BrowserService.getInstance().openClearBrowsingData();
     e.preventDefault();
   },
+
+  /**
+   * @param {Object} route
+   * @private
+   */
+  getQueryString_: function(route) {
+    return window.location.search;
+  }
 });