Migrate data reduction proxy statistics prefs to profile

components/data_reduction_proxy/common/data_reduction_proxy_pref_names.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/data_reduction_proxy/common/data_reduction_proxy_pref_names.h"
 
 namespace data_reduction_proxy {
 namespace prefs {
 
 // A List pref that contains daily totals of the size of all HTTPS
@@ skipping 70 matching lines @@
     "spdy_proxy.was_enabled_before";
 
 // An int64 pref that contains the total size of all HTTP content received from
 // the network.
 const char kHttpReceivedContentLength[] = "http_received_content_length";
 
 // An int64 pref that contains the total original size of all HTTP content
 // received over the network.
 const char kHttpOriginalContentLength[] = "http_original_content_length";
 
+// A boolean specifying whether the data reduction proxy statistics preferences
+// have migrated from local state to the profile.
+const char kStatisticsPrefsMigrated[] =
+    "data_reduction.statistics_prefs_migrated";
+
 }  // namespace prefs
 }  // namespace data_reduction_proxy