MD Settings: Implement search URLs.

chrome/browser/resources/settings/settings_main/settings_main.js

Index: chrome/browser/resources/settings/settings_main/settings_main.js
diff --git a/chrome/browser/resources/settings/settings_main/settings_main.js b/chrome/browser/resources/settings/settings_main/settings_main.js
index d090cdedbb16ce619799256543678264361d0e9d..3cc721051c8c3d425bb11e5819b3b78bacd5c6e3 100644
--- a/chrome/browser/resources/settings/settings_main/settings_main.js
+++ b/chrome/browser/resources/settings/settings_main/settings_main.js
@@ -194,7 +194,19 @@ Polymer({
   },
 
   /** @param {!settings.Route} newRoute */
-  currentRouteChanged: function(newRoute) {
+  currentRouteChanged: function(newRoute, previousRoute) {
+    // Don't issue any new search requests, if the current page is a subpage or
+    // if user returns to a top-level from a subpage, since the search hits are
+    // already highlighted.
+    if (!newRoute.isSubpage() &&

[dpapad, 2016/10/27 17:39:58]

As I was explaining this logic to Tommy, he found a small bug case. I'll be
fixing it and re-ping the CL. Thanks!

+        (!previousRoute || !previousRoute.isSubpage())) {
+      var searchQuery = settings.getQueryParameters().get('search') || '';
+      if (searchQuery)
+        this.searchContents_(searchQuery);
+      else if (this.inSearchMode_)
+        this.searchContents_('');
+    }
+
     // When the route changes from a sub-page to the main page, immediately
     // update hasExpandedSection_ to unhide the other sections.
     if (!newRoute.isSubpage())
@@ -313,22 +325,12 @@ Polymer({
   },
 
   /**
-   * Navigates to the default search page (if necessary).
-   * @private
-   */
-  ensureInDefaultSearchPage_: function() {
-    if (settings.getCurrentRoute() != settings.Route.BASIC)
-      settings.navigateTo(settings.Route.BASIC);
-  },
-
-  /**
    * @param {string} query
    * @return {!Promise} A promise indicating that searching finished.
    */
-  searchContents: function(query) {
+  searchContents_: function(query) {
     // Trigger rendering of the basic and advanced pages and search once ready.
     this.inSearchMode_ = true;
-    this.ensureInDefaultSearchPage_();
     this.toolbarSpinnerActive = true;
 
     return new Promise(function(resolve, reject) {