Enable surprise me wallpaper for new profiles.

chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js

Index: chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js
diff --git a/chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js b/chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js
index 2993edbbed4511fa16a30b81dd8c94751fdfc4d7..a70f35735699e0410869a3d8817d7e3e8f688c6f 100644
--- a/chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js
+++ b/chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js
@@ -213,6 +213,20 @@ SurpriseWallpaper.prototype.nextUpdateTime = function(now) {
   return new Date(nextUpdate).getTime();
 };
 
+/**
+ * Enables surprise me wallpaper.
+ */
+SurpriseWallpaper.prototype.enableSurpriseMe = function() {
+  Constants.WallpaperSyncStorage.get(Constants.AccessSurpriseMeEnabledKey,
+                                     function(items) {
+    if (!items.hasProperty(Constants.AccessSurpriseMeEnabledKey) ||
+        !items[Constants.AccessSurpriseMeEnabledKey]) {
+      WallpaperUtil.saveToStorage(Constants.AccessSurpriseMeEnabledKey,
+                                  true, true, NULL);
+    }
+  });
+};
+
 chrome.app.runtime.onLaunched.addListener(function() {
   if (wallpaperPickerWindow && !wallpaperPickerWindow.contentWindow.closed) {
     wallpaperPickerWindow.focus();