[Offline Pages] Set up the initial prefetching service.

components/offline_pages/core/prefetch/prefetch_service_impl.cc

Index: components/offline_pages/core/prefetch/prefetch_service_impl.cc
diff --git a/components/offline_pages/core/prefetch/prefetch_service_impl.cc b/components/offline_pages/core/prefetch/prefetch_service_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..602b4050e7982f733cd30002ec9d2824972d3e1f
--- /dev/null
+++ b/components/offline_pages/core/prefetch/prefetch_service_impl.cc
@@ -0,0 +1,28 @@
+// Copyright 2017 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/core/prefetch/prefetch_service_impl.h"
+
+namespace offline_pages {
+
+PrefetchServiceImpl::PrefetchServiceImpl() {}
+PrefetchServiceImpl::~PrefetchServiceImpl() = default;
+
+void PrefetchServiceImpl::AddCandidatePrefetchURLs(
+    const std::vector<PrefetchURL>& url_suggestions) {
+  NOTIMPLEMENTED();
+}
+void PrefetchServiceImpl::RemoveAllUnprocessedPrefetchURLs(
+    const std::string& name_space) {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchServiceImpl::RemovePrefetchURLsByClientId(
+    const ClientId& client_id) {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchServiceImpl::Shutdown() {}
+
+}  // namespace offline_pages