Split up extensions storage API implementations for sync and local storage.

chrome/browser/extensions/api/storage/settings_frontend_unittest.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 "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
@@ skipping 75 matching lines @@
  private:
   base::MessageLoop message_loop_;
   content::TestBrowserThread ui_thread_;
   content::TestBrowserThread file_thread_;
 };
 
 // Get a semblance of coverage for both extension and app settings by
 // alternating in each test.
 // TODO(kalman): explicitly test the two interact correctly.
 
+// Tests that the frontend is set up correctly.
+TEST_F(ExtensionSettingsFrontendTest, Basics) {
+  // Local storage is always enabled.
+  EXPECT_TRUE(frontend_->IsStorageEnabled(settings::LOCAL));
+  EXPECT_TRUE(frontend_->GetValueStoreCache(settings::LOCAL));
+
+  // Invalid storage areas are not available.
+  EXPECT_FALSE(frontend_->IsStorageEnabled(settings::INVALID));
+  EXPECT_FALSE(frontend_->GetValueStoreCache(settings::INVALID));
+}
+
 TEST_F(ExtensionSettingsFrontendTest, SettingsPreservedAcrossReconstruction) {
   const std::string id = "ext";
   scoped_refptr<const Extension> extension =
       util::AddExtensionWithId(profile(), id, Manifest::TYPE_EXTENSION);
 
   ValueStore* storage = util::GetStorage(extension, frontend_.get());
 
   // The correctness of Get/Set/Remove/Clear is tested elsewhere so no need to
   // be too rigorous.
   {
@@ skipping 167 matching lines @@
   frontend_->RunWithStorage(
       extension, settings::SYNC, base::Bind(&UnlimitedSyncStorageTestCallback));
   frontend_->RunWithStorage(extension,
                             settings::LOCAL,
                             base::Bind(&UnlimitedLocalStorageTestCallback));
 
   base::MessageLoop::current()->RunUntilIdle();
 }
 
 }  // namespace extensions