Add wallpaper experimental api framework and add a simple category list.

chrome/browser/chromeos/extensions/wallpaper_manager_api.cc

+// Copyright (c) 2012 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/extensions/wallpaper_manager_api.h"
+#include "grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+
+bool WallpaperManagerStringsFunction::RunImpl() {
+  result_.reset(new DictionaryValue());
+  DictionaryValue* dict = reinterpret_cast<DictionaryValue*>(result_.get());
+
+#define SET_STRING(ns, id) \
+  dict->SetString(#id, l10n_util::GetStringUTF16(ns##_##id))
+
+  SET_STRING(IDS_WALLPAPER_MANAGER, FEATURED_LABEL);
+  SET_STRING(IDS_WALLPAPER_MANAGER, NATURE_LABEL);
+  SET_STRING(IDS_WALLPAPER_MANAGER, ABSTRACT_LABEL);
+  SET_STRING(IDS_WALLPAPER_MANAGER, URBAN_LABEL);
+  SET_STRING(IDS_WALLPAPER_MANAGER, COLORS_LABEL);
+  SET_STRING(IDS_WALLPAPER_MANAGER, CUSTOM_LABEL);
+#undef SET_STRING
+
+  return true;
+}