Consider the Access-Control-Allow-Origin header for Background Fetch

content/browser/background_fetch/background_fetch_cross_origin_filter.h

Index: content/browser/background_fetch/background_fetch_cross_origin_filter.h
diff --git a/content/browser/background_fetch/background_fetch_cross_origin_filter.h b/content/browser/background_fetch/background_fetch_cross_origin_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..6fb1c4995bf8531be9106bbff5a000ba8c0ad482
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+++ b/content/browser/background_fetch/background_fetch_cross_origin_filter.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_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CROSS_ORIGIN_FILTER_H_
+#define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CROSS_ORIGIN_FILTER_H_
+
+#include "base/macros.h"
+#include "content/common/content_export.h"
+
+namespace url {
+class Origin;
+}
+
+namespace content {
+
+class BackgroundFetchRequestInfo;
+
+// A filter that decides the CORS rules based on the source of a request and the
+// response URL and headers included in the |request| info.
+class CONTENT_EXPORT BackgroundFetchCrossOriginFilter {
+ public:
+  BackgroundFetchCrossOriginFilter(const url::Origin& source_origin,
+                                   const BackgroundFetchRequestInfo& request);
+  ~BackgroundFetchCrossOriginFilter();
+
+  // Returns whether the Response object passed to the Service Worker event
+  // should include the body included in the response.
+  bool CanPopulateBody() const;
+
+ private:
+  // Whether the response comes from the same origin as the requester.
+  bool is_same_origin_ = false;
+
+  // Whether the Access-Control-Allow-Origin header includes the source origin.
+  bool access_control_allow_origin_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundFetchCrossOriginFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CROSS_ORIGIN_FILTER_H_