Enable surprise me wallpaper for new profiles.

chrome/browser/chromeos/login/wallpaper_manager.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/chromeos/login/wallpaper_manager.h"
 
 #include <numeric>
 #include <vector>
 
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/worker_pool.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/chromeos/extensions/wallpaper_private_api.h"
+#include "chrome/browser/chromeos/login/login_display_host_impl.h"
 #include "chrome/browser/chromeos/login/startup_utils.h"
 #include "chrome/browser/chromeos/login/user.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
+#include "content/public/browser/web_ui.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/codec/jpeg_codec.h"
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/gfx/skia_util.h"
 
 using content::BrowserThread;
 
 namespace {
 
 // The amount of delay before starts to move custom wallpapers to the new place.
@@ skipping 791 matching lines @@
 }
 
 void WallpaperManager::AddObserver(WallpaperManager::Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void WallpaperManager::RemoveObserver(WallpaperManager::Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
+void WallpaperManager::EnableSurpriseMe() {
+  static_cast<chromeos::LoginDisplayHostImpl*>(
+      chromeos::LoginDisplayHostImpl::default_host())

[Nikita (slow), 2014/02/28 10:44:14]

I assumes this call may happen inside session (when you sign in as a new user)
and LoginDisplayHost instance may have been already deleted.

+      ->GetOobeUI()
+      ->web_ui()
+      ->CallJavascriptFunction("SurpriseWallpaper.prototype.enableSurpriseMe");
+}
+
 void WallpaperManager::NotifyAnimationFinished() {
   FOR_EACH_OBSERVER(
       Observer, observers_, OnWallpaperAnimationFinished(last_selected_user_));
 }
 
 // WallpaperManager, private: --------------------------------------------------
 
 bool WallpaperManager::GetWallpaperFromCache(const std::string& user_id,
                                              gfx::ImageSkia* wallpaper) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ skipping 526 matching lines @@
     loading_.push_back(new WallpaperManager::PendingWallpaper(
         (delayed ? GetWallpaperLoadDelay()
                  : base::TimeDelta::FromMilliseconds(0)),
         user_id));
     pending_inactive_ = loading_.back();
   }
   return pending_inactive_;
 }
 
 }  // namespace chromeos