Refactor loading out of ExtensionService.

chrome/browser/extensions/installed_extension_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_EXTENSION_LOADER_H_
+#define CHROME_BROWSER_EXTENSIONS_INSTALLED_EXTENSION_LOADER_H_
+#pragma once
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"

[Aaron Boodman, 2011/10/28 22:21:58]

Double check that all these includes and forward declarations are needed.

[Yoyo Zhou, 2011/10/31 21:58:15]

Done.

+
+class ComponentLoader;
+class Extension;
+class ExtensionInfo;
+class ExtensionPrefs;
+class ExtensionService;
+class FilePath;
+
+// Loads installed extensions from the .

[Aaron Boodman, 2011/10/28 22:21:58]

Ooohh, suspense. Loads them from where?? I must know!

[Yoyo Zhou, 2011/10/31 21:58:15]

leave 'em hanging.

+class InstalledExtensionLoader
+    : public base::RefCountedThreadSafe<InstalledExtensionLoader> {
+ public:
+  InstalledExtensionLoader(ExtensionService* extension_service,
+                           ExtensionPrefs* extension_prefs);
+  virtual ~InstalledExtensionLoader();
+
+  ExtensionService* extension_service() { return extension_service_; }
+
+  ExtensionPrefs* extension_prefs() { return extension_prefs_; }
+
+  // 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 GetExtensionCreateFlagsForInstalledExtension(
+      const ExtensionInfo* info);
+
+  ExtensionService* extension_service_;
+
+  ExtensionPrefs* extension_prefs_;
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_INSTALLED_EXTENSION_LOADER_H_