Implement BackgroundFetchManager.fetch() and struct traits

content/common/background_fetch/background_fetch_types.h

Index: content/common/background_fetch/background_fetch_types.h
diff --git a/content/common/background_fetch/background_fetch_types.h b/content/common/background_fetch/background_fetch_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..6e0723b5ea00882e9114fa4df5d4234a9c330140
--- /dev/null
+++ b/content/common/background_fetch/background_fetch_types.h
@@ -0,0 +1,60 @@
+// 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.
+
+#ifndef CONTENT_COMMON_BACKGROUND_FETCH_BACKGROUND_FETCH_TYPES_H_
+#define CONTENT_COMMON_BACKGROUND_FETCH_BACKGROUND_FETCH_TYPES_H_
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+#include "content/common/content_export.h"
+
+namespace content {
+
+// Represents the definition of an icon developers can optionally provide with a
+// Background Fetch fetch. Analogous to the following structure in the spec:
+// https://wicg.github.io/background-fetch/#background-fetch-manager
+struct CONTENT_EXPORT IconDefinition {
+  IconDefinition();
+  IconDefinition(const IconDefinition& other);

[dcheng, 2017/03/21 07:03:20]

http://en.cppreference.com/w/cpp/language/move_constructor#Implicitly-declare...
are the rules for an implicitly declared move constructor, but since this class
has a user-defined copy constructor, I think we won't have any move semantics.

[Peter Beverloo, 2017/03/21 13:46:27]

Acknowledged.

+  ~IconDefinition();
+
+  std::string src;
+  std::string sizes;
+  std::string type;
+};
+
+// Represents the optional options a developer can provide when starting a new
+// Background Fetch fetch. Analogous to the following structure in the spec:
+// https://wicg.github.io/background-fetch/#background-fetch-manager
+struct CONTENT_EXPORT BackgroundFetchOptions {
+  BackgroundFetchOptions();
+  BackgroundFetchOptions(const BackgroundFetchOptions& other);
+  ~BackgroundFetchOptions();
+
+  std::vector<IconDefinition> icons;
+  std::string title;
+  int64_t total_download_size = 0;
+};
+
+// Represents the information associated with a Background Fetch registration.
+// Analogous to the following structure in the spec:
+// https://wicg.github.io/background-fetch/#background-fetch-registration
+struct CONTENT_EXPORT BackgroundFetchRegistration {
+  BackgroundFetchRegistration();
+  BackgroundFetchRegistration(const BackgroundFetchRegistration& other);
+  ~BackgroundFetchRegistration();
+
+  std::string tag;
+  std::vector<IconDefinition> icons;
+  std::string title;
+  int64_t total_download_size = 0;
+
+  // TODO(peter): Support the `activeFetches` member of the specification.
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_BACKGROUND_FETCH_BACKGROUND_FETCH_TYPES_H_