Sending the time of the pingback request in the request

components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.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 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 base {
+class Time;
+}
+
 namespace net {
 class URLFetcher;
 class URLRequestContextGetter;
 }
 
 namespace data_reduction_proxy {
 class DataReductionProxyData;
 struct DataReductionProxyPageLoadTiming;
+class RecordPageloadMetricsRequest;
 
 // 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);
 
   // Sets the probability of actually sending a pingback to the server for any
   // call to SendPingback.
   void SetPingbackReportingFraction(float pingback_reporting_fraction);
 
  protected:
   // Generates a float in the range [0, 1). Virtualized in testing.
   virtual float GenerateRandomFloat() const;
 
+  // Returns the current time. Virtualized in testing.
+  virtual base::Time CurrentTime() const;
+
  private:
   // URLFetcherDelegate implmentation:
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // Whether a pingback should be sent.
   bool ShouldSendPingback() const;
 
   // Creates an URLFetcher that will POST to |secure_proxy_url_| using
   // |url_request_context_|. The max retires is set to 5.
+  // The caller must ensure that request_data| is non-null. The caller owns
+  // |request_data|.
   std::unique_ptr<net::URLFetcher> MaybeCreateFetcherForDataAndStart(
-      const std::string& data);
+      RecordPageloadMetricsRequest* request_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_;
+  std::list<std::unique_ptr<RecordPageloadMetricsRequest>> data_to_send_;
 
   // The probability of sending a pingback to the server.
   float pingback_reporting_fraction_;
 
   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_