Implement BackgroundFetchManager.fetch() and struct traits

content/common/background_fetch/background_fetch_types.cc

Index: content/common/background_fetch/background_fetch_types.cc
diff --git a/content/common/background_fetch/background_fetch_types.cc b/content/common/background_fetch/background_fetch_types.cc
new file mode 100644
index 0000000000000000000000000000000000000000..60b6a692b0c81a12a243228a1254a65dccf6ed47
--- /dev/null
+++ b/content/common/background_fetch/background_fetch_types.cc
@@ -0,0 +1,29 @@
+// 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 "content/common/background_fetch/background_fetch_types.h"
+
+namespace content {
+
+IconDefinition::IconDefinition() = default;
+
+IconDefinition::IconDefinition(const IconDefinition& other) = default;
+
+IconDefinition::~IconDefinition() = default;
+
+BackgroundFetchOptions::BackgroundFetchOptions() = default;
+
+BackgroundFetchOptions::BackgroundFetchOptions(
+    const BackgroundFetchOptions& other) = default;
+
+BackgroundFetchOptions::~BackgroundFetchOptions() = default;
+
+BackgroundFetchRegistration::BackgroundFetchRegistration() = default;
+
+BackgroundFetchRegistration::BackgroundFetchRegistration(
+    const BackgroundFetchRegistration& other) = default;
+
+BackgroundFetchRegistration::~BackgroundFetchRegistration() = default;
+
+}  // namespace content