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
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+++ b/content/common/background_fetch/background_fetch_types.h
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+// 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
+//
+// Parsing of the icon definitions as well as fetching an appropriate icon will
+// be done by Blink in the renderer process. The browser process is expected to
+// treat these values as opaque strings.
+struct CONTENT_EXPORT IconDefinition {
+  IconDefinition();
+  IconDefinition(const IconDefinition& other);
+  ~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_