[Offline Pages] Set up the initial prefetching service.

components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc

Index: components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc
diff --git a/components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc b/components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..af4236701a208aa5f11e0be0bae534011b89ceb2
--- /dev/null
+++ b/components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc
@@ -0,0 +1,19 @@
+// 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"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+namespace offline_pages {
+
+TEST(PrefetchServiceTest, ServiceDoesNotCrash) {
+  PrefetchServiceImpl service;
+
+  service.OnNewURLSuggestions(std::vector<GURL>());
+  service.RemoveAllUnprocessedURLSuggestions();

[carlosk, 2017/04/11 17:31:36]

Question: how come debug build tests don't crash here because of the
NOTIMPLEMENTED calls?

[dewittj, 2017/04/11 21:25:49]

NOTIMPLEMENTED does not crash, it just logs.  NOTREACHED() crashes.

+}
+
+}  // namespace offline_pages