Precache should cancel when there is user traffic

components/data_use_measurement/content/data_use_measurement.h

 // Copyright 2015 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_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_
 #define COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 23 matching lines @@
 // http://crbug.com/527460
 class DataUseMeasurement {
  public:
   explicit DataUseMeasurement(
       const metrics::UpdateUsagePrefCallbackType& metrics_data_use_forwarder);
   ~DataUseMeasurement();
 
   // Records the data use of the |request|, thus |request| must be non-null.
   void ReportDataUseUMA(const net::URLRequest* request) const;
 
+  // Returns true if the URLRequest |request| is initiated by user traffic.
+  static bool IsUserTraffic(const net::URLRequest* request);
+
 #if defined(OS_ANDROID)
   // This function should just be used for testing purposes. A change in
   // application state can be simulated by calling this function.
   void OnApplicationStateChangeForTesting(
       base::android::ApplicationState application_state);
 #endif
 
  private:
   // Specifies that data is received or sent, respectively.
   enum TrafficDirection { DOWNSTREAM, UPSTREAM };
@@ skipping 48 matching lines @@
   // foreground or in the background. It is owned by DataUseMeasurement.
   std::unique_ptr<base::android::ApplicationStatusListener> app_listener_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(DataUseMeasurement);
 };
 
 }  // namespace data_use_measurement
 
 #endif  // COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_