[Offline] Creates metadata store interface for offline pages

Offline pages metadata store:
* Creates interface for the store
* The following actions are available on the store:
  - AddOfflinePage,
  - RemoveOfflinePage,
  - Load,
* Updates to the components_unittests to include offline
  pages

BUG=491352

Review URL: https://codereview.chromium.org/1160283003

Cr-Commit-Position: refs/heads/master@{#333697}

1 files changed, 68 insertions, 0 deletions

diff --git a/components/offline_pages/offline_page_model_unittest.cc b/components/offline_pages/offline_page_model_unittest.cc
new file mode 100644
index 0000000..b6119ef
--- /dev/null
+++ b/components/offline_pages/offline_page_model_unittest.cc
@@ -0,0 +1,68 @@
+// Copyright 2015 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 "components/offline_pages/offline_page_model.h"
+
+#include "components/offline_pages/offline_page_metadata_store.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+namespace offline_pages {
+
+namespace {
+
+class OfflinePageTestStore : public OfflinePageMetadataStore {
+ public:
+  ~OfflinePageTestStore() override;
+
+  // OfflinePageMetadataStore overrides:
+  void Load(const LoadCallback& callback) override;
+  void AddOfflinePage(const OfflinePageItem& offline_page,
+                      const UpdateCallback& callback) override;
+  void RemoveOfflinePage(const GURL& page_url,
+                         const UpdateCallback& callback) override;
+};
+
+OfflinePageTestStore::~OfflinePageTestStore() {
+}
+
+void OfflinePageTestStore::Load(const LoadCallback& callback) {
+}
+
+void OfflinePageTestStore::AddOfflinePage(const OfflinePageItem& offline_page,
+                                          const UpdateCallback& callback) {
+}
+
+void OfflinePageTestStore::RemoveOfflinePage(const GURL& page_url,
+                                             const UpdateCallback& callback) {
+}
+
+class OfflinePageModelTest : public testing::Test {
+ public:
+  OfflinePageModelTest();
+  ~OfflinePageModelTest() override;
+
+  scoped_ptr<OfflinePageMetadataStore> BuildStore();
+};
+
+OfflinePageModelTest::OfflinePageModelTest() {
+}
+
+OfflinePageModelTest::~OfflinePageModelTest() {
+}
+
+scoped_ptr<OfflinePageMetadataStore> OfflinePageModelTest::BuildStore() {
+  return scoped_ptr<OfflinePageMetadataStore>(new OfflinePageTestStore());
+}
+
+TEST_F(OfflinePageModelTest, Initialize) {
+  scoped_ptr<OfflinePageMetadataStore> store = BuildStore();
+  OfflinePageMetadataStore* store_ptr = store.get();
+  OfflinePageModel model(store.Pass());
+  EXPECT_EQ(store_ptr, model.GetStoreForTesting());
+}
+
+}  // namespace
+
+}  // namespace offline_pages