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diff --git a/chrome/browser/extensions/settings/settings_test_util.h b/chrome/browser/extensions/settings/settings_test_util.h
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+++ b/chrome/browser/extensions/settings/settings_test_util.h
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+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_TEST_UTIL_H_
+#define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_TEST_UTIL_H_
+
+#include <set>
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/extensions/event_router.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/settings/settings_namespace.h"
+#include "chrome/browser/extensions/settings/settings_storage_factory.h"
+#include "chrome/browser/extensions/test_extension_service.h"
+#include "chrome/browser/extensions/test_extension_system.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/test/base/testing_profile.h"
+
+class ValueStore;
+
+namespace extensions {
+
+class SettingsFrontend;
+// Utilities for extension settings API tests.
+namespace settings_test_util {
+
+// Synchronously gets the storage area for an extension from |frontend|.
+ValueStore* GetStorage(
+    const std::string& extension_id,
+    settings_namespace::Namespace setting_namespace,
+    SettingsFrontend* frontend);
+
+// Synchronously gets the SYNC storage for an extension from |frontend|.
+ValueStore* GetStorage(
+    const std::string& extension_id,
+    SettingsFrontend* frontend);
+
+// An ExtensionService which allows extensions to be hand-added to be returned
+// by GetExtensionById.
+class MockExtensionService : public TestExtensionService {
+ public:
+  MockExtensionService();
+  virtual ~MockExtensionService();
+
+  // Adds an extension with id |id| to be returned by GetExtensionById.
+  void AddExtensionWithId(const std::string& id, Extension::Type type);
+
+  // Adds an extension with id |id| to be returned by GetExtensionById, with
+  // a set of permissions.
+  void AddExtensionWithIdAndPermissions(
+      const std::string& id,
+      Extension::Type type,
+      const std::set<std::string>& permissions);
+
+  virtual const Extension* GetExtensionById(
+      const std::string& id, bool include_disabled) const OVERRIDE;
+
+ private:
+  std::map<std::string, scoped_refptr<Extension> > extensions_;
+};
+
+// A mock ExtensionSystem to serve an EventRouter.
+class MockExtensionSystem : public TestExtensionSystem {
+ public:
+  explicit MockExtensionSystem(Profile* profile);
+  virtual ~MockExtensionSystem();
+
+  virtual EventRouter* event_router() OVERRIDE;
+  virtual ExtensionService* extension_service() OVERRIDE;
+
+ private:
+  scoped_ptr<EventRouter> event_router_;
+  MockExtensionService extension_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockExtensionSystem);
+};
+
+// A Profile which returns an ExtensionService with enough functionality for
+// the tests.
+class MockProfile : public TestingProfile {
+ public:
+  explicit MockProfile(const FilePath& file_path);
+  virtual ~MockProfile();
+};
+
+// SettingsStorageFactory which acts as a wrapper for other factories.
+class ScopedSettingsStorageFactory : public SettingsStorageFactory {
+ public:
+  ScopedSettingsStorageFactory();
+
+  explicit ScopedSettingsStorageFactory(
+      const scoped_refptr<SettingsStorageFactory>& delegate);
+
+  // Sets the delegate factory (equivalent to scoped_ptr::reset).
+  void Reset(const scoped_refptr<SettingsStorageFactory>& delegate);
+
+  // SettingsStorageFactory implementation.
+  virtual ValueStore* Create(const FilePath& base_path,
+                             const std::string& extension_id) OVERRIDE;
+
+ private:
+  // SettingsStorageFactory is refcounted.
+  virtual ~ScopedSettingsStorageFactory();
+
+  scoped_refptr<SettingsStorageFactory> delegate_;
+};
+
+}  // namespace settings_test_util
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_TEST_UTIL_H_