Reporting: Implement uploader.

net/reporting/reporting_uploader.h

+// Copyright 2016 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 NET_REPORTING_REPORTING_UPLOADER_H_
+#define NET_REPORTING_REPORTING_UPLOADER_H_
+
+#include <memory>
+#include <string>
+
+#include "base/callback.h"
+#include "net/base/net_export.h"
+
+class GURL;
+
+namespace net {
+
+class URLRequestContext;
+
+// Uploads already-serialized reports and converts responses to one of the
+// specified outcomes.
+class NET_EXPORT ReportingUploader {
+ public:
+  enum class Outcome { SUCCESS, REMOVE_ENDPOINT, FAILURE };
+
+  using Callback = base::Callback<void(Outcome outcome)>;
+
+  static const char kUploadContentType[];
+
+  virtual ~ReportingUploader();
+
+  // Starts to upload the reports in |json| (properly tagged as JSON data) to
+  // |url|, and calls |callback| when complete (whether successful or not).
+  virtual void StartUpload(const GURL& url,
+                           const std::string& json,
+                           const Callback& callback) = 0;
+
+  // Creates a real implementation of |ReportingUploader| that uploads reports
+  // using |context|.
+  static std::unique_ptr<ReportingUploader> Create(
+      const URLRequestContext* context);
+};
+
+}  // namespace net
+
+#endif  // NET_REPORTING_REPORTING_UPLOADER_H_