Extension Settings API: make it so that when leveldb storage areas fail to be

chrome/browser/extensions/settings/settings_test_util.h

Index: chrome/browser/extensions/settings/settings_test_util.h
diff --git a/chrome/browser/extensions/settings/settings_test_util.h b/chrome/browser/extensions/settings/settings_test_util.h
index bad77a5f558e985b6ba45aff8224ee59f8d0110b..9129db9262c9bd955eb21c0689b71ca2f0f2b239 100644
--- a/chrome/browser/extensions/settings/settings_test_util.h
+++ b/chrome/browser/extensions/settings/settings_test_util.h
@@ -1,3 +1,5 @@
+//
+//
 // 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.
@@ -12,14 +14,16 @@
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/settings/settings_storage_factory.h"
 #include "chrome/browser/extensions/test_extension_service.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/test/base/testing_profile.h"
 
-class SettingsFrontend;
-
 namespace extensions {
 
+class SettingsFrontend;
+class SettingsStorage;
+
 // Utilities for extension settings API tests.
 namespace settings_test_util {
 
@@ -63,6 +67,45 @@ class MockProfile : public TestingProfile {
   scoped_ptr<ExtensionEventRouter> event_router_;
 };
 
+// A SettingsStorageFactory which delegates to other factories.
+class DelegatingSettingsStorageFactory : public SettingsStorageFactory {
+ public:
+  // Creates with an initial delegate.
+  DelegatingSettingsStorageFactory(
+      // Ownership taken.
+      SettingsStorageFactory* delegate);
+
+  virtual ~DelegatingSettingsStorageFactory();
+
+  // Sets the delegate for Create calls.  The existing delegate is deleted.
+  void Reset(
+      // Ownership taken.
+      SettingsStorageFactory* delegate);
+
+  // SettingsStorageFactory implementation.
+  virtual SettingsStorage* Create(
+      const FilePath& base_path, const std::string& extension_id) OVERRIDE;
+
+ private:
+  scoped_ptr<SettingsStorageFactory> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(DelegatingSettingsStorageFactory);
+};
+
+// A SettingsStorageFactory which always returns NULL.
+class NullSettingsStorageFactory : public SettingsStorageFactory {
+ public:
+  NullSettingsStorageFactory() {}
+  virtual ~NullSettingsStorageFactory() {}
+
+  // SettingsStorageFactory implementation.
+  virtual SettingsStorage* Create(
+      const FilePath& base_path, const std::string& extension_id) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NullSettingsStorageFactory);
+};
+
 }  // namespace settings_test_util
 
 }  // namespace extensions