mash: Port mojo:ash_sysui's ContextMenuMus to mojo:ash.

ash/test/test_user_wallpaper_delegate.cc

-// Copyright 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 "ash/test/test_user_wallpaper_delegate.h"
-
-#include "ash/desktop_background/desktop_background_controller.h"
-#include "ash/shell.h"
-
-namespace ash {
-namespace test {
-
-TestUserWallpaperDelegate::TestUserWallpaperDelegate()
-    : update_wallpaper_count_(0) {}
-
-TestUserWallpaperDelegate::~TestUserWallpaperDelegate() {}
-
-void TestUserWallpaperDelegate::UpdateWallpaper(bool clear_cache) {
-  DefaultUserWallpaperDelegate::UpdateWallpaper(clear_cache);
-  if (!custom_wallpaper_.isNull()) {
-    Shell::GetInstance()->desktop_background_controller()->SetWallpaperImage(
-        custom_wallpaper_, wallpaper::WALLPAPER_LAYOUT_STRETCH);
-  }
-  update_wallpaper_count_++;
-}
-
-int TestUserWallpaperDelegate::GetUpdateWallpaperCountAndReset() {
-  int count = update_wallpaper_count_;
-  update_wallpaper_count_ = 0;
-  return count;
-}
-
-}  // namespace test
-}  // namespace ash