Track NTP snippets data usage.

components/ntp_snippets/ntp_snippets_fetcher.cc

 // 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.
 
 #include "components/ntp_snippets/ntp_snippets_fetcher.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
+#include "components/data_use_measurement/core/data_use_user_data.h"
 #include "google_apis/google_api_keys.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
 
 using net::URLFetcher;
 using net::URLRequestContextGetter;
 using net::HttpRequestHeaders;
@@ skipping 62 matching lines @@
                                        int count) {
   const std::string& key = is_stable_channel_
                                ? google_apis::GetAPIKey()
                                : google_apis::GetNonStableAPIKey();
   std::string url =
       base::StringPrintf(kContentSnippetsServerFormat, key.c_str());
   url_fetcher_ = URLFetcher::Create(GURL(url), URLFetcher::POST, this);
   url_fetcher_->SetRequestContext(url_request_context_getter_.get());
   url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                              net::LOAD_DO_NOT_SAVE_COOKIES);
+  data_use_measurement::DataUseUserData::AttachToFetcher(
+      url_fetcher_.get(), data_use_measurement::DataUseUserData::NTP_SNIPPETS);
   HttpRequestHeaders headers;
   headers.SetHeader("Content-Type", "application/json; charset=UTF-8");
   url_fetcher_->SetExtraRequestHeaders(headers.ToString());
   std::string host_restricts;
   for (const std::string& host : hosts)
     host_restricts += base::StringPrintf(kHostRestrictFormat, host.c_str());
   url_fetcher_->SetUploadData("application/json",
                               base::StringPrintf(kRequestParameterFormat,
                                                  host_restricts.c_str(),
                                                  count));
@@ skipping 32 matching lines @@
 
   } else {
     bool stores_result_to_string = source->GetResponseAsString(&response);
     DCHECK(stores_result_to_string);
   }
 
   callback_list_.Notify(response, message);
 }
 
 }  // namespace ntp_snippets