Use a distinct source parameter on gaia endpoints for the reconcilor.

google_apis/gaia/gaia_urls.cc

 // Copyright (c) 2012 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 "google_apis/gaia/gaia_urls.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/strings/stringprintf.h"
 #include "google_apis/gaia/gaia_switches.h"
 #include "google_apis/google_api_keys.h"
 
 namespace {
 
 // Gaia service constants
 const char kDefaultGaiaUrl[] = "https://accounts.google.com";
 const char kDefaultGoogleApisBaseUrl[] = "https://www.googleapis.com";
 
 // API calls from accounts.google.com
@@ skipping 219 matching lines @@
   return oauth2_token_info_url_;
 }
 
 const GURL& GaiaUrls::oauth2_revoke_url() const {
   return oauth2_revoke_url_;
 }
 
 const GURL& GaiaUrls::gaia_login_form_realm() const {
   return gaia_url_;
 }
+
+GURL GaiaUrls::ListAccountsURLWithSource(const std::string& source) {
+  if (source.empty()) {
+    return list_accounts_url();
+  } else {
+    std::string query = list_accounts_url().query();
+    return list_accounts_url().Resolve(
+        base::StringPrintf("?source=%s&%s", source.c_str(), query.c_str()));
+  }
+}
+
+GURL GaiaUrls::GetCheckConnectionInfoURLWithSource(const std::string& source) {
+  return source.empty()
+      ? get_check_connection_info_url()
+      : get_check_connection_info_url().Resolve(
+            base::StringPrintf("?source=%s", source.c_str()));
+}