Show file type icons in launcher search results.

ui/file_manager/file_manager/background/js/launcher_search.js

 // Copyright 2015 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.
 
 /**
  * Provides drive search results to chrome launcher.
  * @constructor
  * @struct
  */
 function LauncherSearch() {
@@ skipping 100 matching lines @@
         types: 'ALL',
         maxResults: limit
       }, function(results) {
         // If query is already changed, discard the results.
         if (queryId !== this.queryId_ || results.length === 0)
           return;
 
         chrome.launcherSearchProvider.setSearchResults(
             queryId,
             results.map(function(result) {
-              // TODO(yawano): Set custome icon to a result when the API becomes
-              //     to support it.
+              // Use high-dpi icons since preferred icon size is 24px in the
+              // current implementation.
+              //
+              // TODO(yawano): Use filetype_folder_shared.png for a shared
+              //     folder.
+              var iconUrl = chrome.runtime.getURL(
+                  'foreground/images/filetype/2x/filetype_' +
+                  FileType.getIcon(result.entry) + '.png');
               return {
                 itemId: result.entry.toURL(),
                 title: result.entry.name,
+                iconUrl: iconUrl,
                 // Relevance is set as 2 for all results as a temporary
                 // implementation. 2 is the middle value.
                 // TODO(yawano): Implement practical relevance calculation.
                 relevance: 2
               };
             }));
       }.bind(this));
 };
 
 /**
@@ skipping 68 matching lines @@
  * @param {string} selectionURL A url to be selected.
  * @private
  */
 LauncherSearch.prototype.openFileManagerWithSelectionURL_ = function(
     selectionURL) {
   launchFileManager(
       { selectionURL: selectionURL },
       undefined, /* App ID */
       LaunchType.FOCUS_SAME_OR_CREATE);
 };