Refactor loading out of ExtensionService.

chrome/browser/extensions/installed_loader.h

+// Copyright (c) 2011 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_INSTALLED_LOADER_H_
+#define CHROME_BROWSER_EXTENSIONS_INSTALLED_LOADER_H_
+#pragma once
+
+class Extension;
+class ExtensionPrefs;
+class ExtensionService;
+struct ExtensionInfo;
+
+namespace extensions {
+
+// Loads installed extensions from the prefs.
+class InstalledLoader {
+ public:
+  explicit InstalledLoader(ExtensionService* extension_service);
+  virtual ~InstalledLoader();
+
+  // Loads extension from prefs.
+  void Load(const ExtensionInfo& info, bool write_to_prefs);
+
+  // Loads all installed extensions (used by startup and testing code).
+  void LoadAllExtensions();
+
+ private:
+  // Returns the flags that should be used with Extension::Create() for an
+  // extension that is already installed.
+  int GetCreationFlags(const ExtensionInfo* info);
+
+  ExtensionService* extension_service_;
+
+  ExtensionPrefs* extension_prefs_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_INSTALLED_LOADER_H_