Record the data use by content type

components/data_use_measurement/core/url_request_classifier.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_USE_MEASUREMENT_CORE_URL_REQUEST_CLASSIFIER_H_
 #define COMPONENTS_DATA_USE_MEASUREMENT_CORE_URL_REQUEST_CLASSIFIER_H_
 
+#include "components/data_use_measurement/core/data_use_user_data.h"
+
 namespace net {
+class HttpResponseHeaders;
 class URLRequest;
 }
 
 namespace data_use_measurement {
 
 // Interface for a classifier that can classify URL requests.
 class URLRequestClassifier {
  public:
   virtual ~URLRequestClassifier() {}
 
   // Returns true if the URLRequest |request| is initiated by user traffic.
   virtual bool IsUserRequest(const net::URLRequest& request) const = 0;
+
+  // Returns the content type of the URL request |request| with response headers
+  // |response_headers|. |is_app_foreground| and |is_tab_visible| indicate the
+  // current app and tab visibility state.
+  virtual DataUseUserData::DataUseContentType GetContentType(
+      const net::URLRequest& request,
+      const net::HttpResponseHeaders& response_headers) const = 0;
 };
 
 }  // namespace data_use_measurement
 
 #endif  // COMPONENTS_DATA_USE_MEASUREMENT_CORE_URL_REQUEST_CLASSIFIER_H_