Support needed to measure user and service traffic in Chrome.

components/suggestions/suggestions_service.cc

 // Copyright 2014 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/suggestions/suggestions_service.h"
 
 #include <string>
 
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
+// The following line is commented because it violates dependency.
+// #include "chrome/browser/net/data_use_user_data.h"

[sclittle, 2015/08/19 23:32:40]

Yeah, the data_use_measurement stuff should probably be moved into a new
component if you want to depend on it from other components.

Note that code in components isn't allowed to have chrome/ dependencies, like
the commented out line here.

Here's an example component for wifi prefetch:
https://code.google.com/p/chromium/codesearch#chromium/src/components/precache/

You could put the data_use_measurement stuff inside a content/ subdirectory so
that it can depend on the content/ stuff it needs, and put the
data_use_user_data stuff inside a core/ subdirectory.

[amohammadkhan, 2015/08/21 23:06:32]

Done.

 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/suggestions/blacklist_store.h"
 #include "components/suggestions/suggestions_store.h"
 #include "components/variations/net/variations_http_header_provider.h"
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/base/url_util.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
@@ skipping 217 matching lines @@
   }
   pending_request_ = CreateSuggestionsRequest(url);
   pending_request_->Start();
   last_request_started_time_ = TimeTicks::Now();
 }
 
 scoped_ptr<net::URLFetcher> SuggestionsService::CreateSuggestionsRequest(
     const GURL& url) {
   scoped_ptr<net::URLFetcher> request =
       net::URLFetcher::Create(0, url, net::URLFetcher::GET, this);
+  request->SetURLRequestUserData(
+        DataUseUserData::kUserDataKey,
+        base::Bind(&CreateDataUseUserData,
+                   "Suggestion"));
   request->SetLoadFlags(net::LOAD_DISABLE_CACHE);
   request->SetRequestContext(url_request_context_);
   // Add Chrome experiment state to the request headers.
   net::HttpRequestHeaders headers;
   variations::VariationsHttpHeaderProvider::GetInstance()->AppendHeaders(
       request->GetOriginalURL(), false, false, &headers);
   request->SetExtraRequestHeaders(headers.ToString());
   return request;
 }
 
@@ skipping 128 matching lines @@
     scheduling_delay_ = TimeDelta::FromSeconds(kDefaultSchedulingDelaySec);
   } else {
     TimeDelta candidate_delay =
         scheduling_delay_ * kSchedulingBackoffMultiplier;
     if (candidate_delay < TimeDelta::FromSeconds(kSchedulingMaxDelaySec))
       scheduling_delay_ = candidate_delay;
   }
 }
 
 }  // namespace suggestions