Sending a data saver Pageload metrics pingback

components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.h
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+// 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 COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_PINGBACK_CLIENT_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_PINGBACK_CLIENT_H_
+
+#include <list>
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "base/threading/thread_checker.h"
+#include "net/url_request/url_fetcher_delegate.h"
+#include "url/gurl.h"
+
+namespace net {
+class URLFetcher;
+class URLRequestContextGetter;
+}
+
+namespace data_reduction_proxy {
+class DataReductionProxyData;
+struct DataReductionProxyPageLoadTiming;
+
+// Manages pingbacks about page load timing information to the data saver proxy
+// server. This class is not thread safe.
+class DataReductionProxyPingbackClient : public net::URLFetcherDelegate {
+ public:
+  // The caller must ensure that |url_request_context| remains alive for the
+  // lifetime of the |DataReductionProxyPingbackClient| instance.
+  explicit DataReductionProxyPingbackClient(
+      net::URLRequestContextGetter* url_request_context);
+  ~DataReductionProxyPingbackClient() override;
+
+  // Sends a pingback to the data saver proxy server about various timing
+  // information.
+  virtual void SendPingback(const DataReductionProxyData& data,
+                            const DataReductionProxyPageLoadTiming& timing);
+
+ private:
+  // URLFetcherDelegate implmentation:
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+  // Whether a pingback should be sent. Virtualized for testing.
+  virtual bool ShouldSendPingback() const;
+
+  // Creates an URLFetcher that will POST to |secure_proxy_url_| using
+  // |url_request_context_|. The max retires is set to 5.
+  std::unique_ptr<net::URLFetcher> MaybeCreateFetcherForDataAndStart(
+      const std::string& data);
+
+  net::URLRequestContextGetter* url_request_context_;
+
+  // The URL for the data saver proxy's ping back service.
+  const GURL pingback_url_;
+
+  // The currently running fetcher.
+  std::unique_ptr<net::URLFetcher> current_fetcher_;
+
+  // Serialized data to send to the data saver proxy server.
+  std::list<std::string> data_to_send_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyPingbackClient);
+};
+
+}  // namespace data_reduction_proxy
+
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_PINGBACK_CLIENT_H_