X-Chrome-Variations logic refactoring

chrome/browser/autocomplete/search_provider.cc

Index: chrome/browser/autocomplete/search_provider.cc
diff --git a/chrome/browser/autocomplete/search_provider.cc b/chrome/browser/autocomplete/search_provider.cc
index 2828a54139ff9b46bca6c81716b20565c0a82f18..4ec8c8e8b3e21b85481282ce73d77aec43a14470 100644
--- a/chrome/browser/autocomplete/search_provider.cc
+++ b/chrome/browser/autocomplete/search_provider.cc
@@ -25,6 +25,7 @@
 #include "chrome/browser/autocomplete/history_url_provider.h"
 #include "chrome/browser/autocomplete/keyword_provider.h"
 #include "chrome/browser/autocomplete/url_prefix.h"
+#include "chrome/browser/chrome_metrics_helper.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/history/in_memory_database.h"
@@ -44,6 +45,7 @@
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_util.h"
+#include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_status.h"
@@ -630,6 +632,11 @@ net::URLFetcher* SearchProvider::CreateSuggestFetcher(
       net::URLFetcher::Create(id, suggest_url, net::URLFetcher::GET, this);
   fetcher->SetRequestContext(profile_->GetRequestContext());
   fetcher->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES);
+  // Add Chrome experiment state to the request headers.
+  net::HttpRequestHeaders headers;
+  ChromeMetricsHelper::GetInstance()->AppendHeaders(
+      fetcher->GetOriginalURL(), profile_->IsOffTheRecord(), false, &headers);
+  fetcher->SetExtraRequestHeaders(headers.ToString());
   fetcher->Start();
   return fetcher;
 }