Enable profile switching for standalone App Launcher via the Settings App.

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index daef4fbea5dc17b4d60324aae9dfafea96c92e74..d607f789375a9221dc8b9a38cbdbc3f86acc549e 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -180,6 +180,12 @@ cr.define('options', function() {
         $('profiles-create').onclick = function(event) {
           ManageProfileOverlay.showCreateDialog();
         };
+        if (OptionsPage.isSettingsApp()) {
+          $('profiles-app-list-switch').onclick = function(event) {
+            var selectedProfile = self.getSelectedProfileItem_();
+            chrome.send('switchAppListProfile', [selectedProfile.filePath]);
+          };
+        }
         $('profiles-manage').onclick = function(event) {
           ManageProfileOverlay.showManageDialog();
         };
@@ -918,6 +924,10 @@ cr.define('options', function() {
       else
         $('profiles-manage').title = '';
       $('profiles-delete').disabled = !hasSelection && !hasSingleProfile;
+      if (OptionsPage.isSettingsApp()) {
+        $('profiles-app-list-switch').disabled = !hasSelection ||
+            selectedProfile.isCurrentProfile;
+      }
       var importData = $('import-data');
       if (importData) {
         importData.disabled = $('import-data').disabled = hasSelection &&
@@ -939,6 +949,8 @@ cr.define('options', function() {
       $('profiles-delete').textContent = hasSingleProfile ?
           loadTimeData.getString('profilesDeleteSingle') :
           loadTimeData.getString('profilesDelete');
+      if (OptionsPage.isSettingsApp())
+        $('profiles-app-list-switch').hidden = hasSingleProfile;
     },
 
     /**