[Not for review] Add TRACE_EVENTs and chrome://flags for preconnect

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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 "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 1030 matching lines @@
     "How the password manager handles autofill for the sync credential.";
 
 const char kPasswordImportExportName[] = "Password import and export";
 
 const char kPasswordImportExportDescription[] =
     "Import and Export functionality in password settings.";
 
 const char kProtectSyncCredentialOnReauthName[] =
     "Autofill sync credential only for transactional reauth pages";
 
+const char kPredictorPreconnectName[] = "Predictor preconnect";
+
+const char kPredictorPreconnectDescription[] = "Enable predictor preconnect.";
+
 const char kProtectSyncCredentialOnReauthDescription[] =
     "How the password manager handles autofill for the sync credential only "
     "for transactional reauth pages.";
 
 const char kIconNtpName[] = "Large icons on the New Tab page";
 
 const char kIconNtpDescription[] =
     "Enable the experimental New Tab page using large icons.";
 
 const char kPushApiBackgroundModeName[] = "Enable Push API background mode";
@@ skipping 2142 matching lines @@
 
 const char kDisableNewVirtualKeyboardBehaviorName[] =
     "New window behavior for the accessibility keyboard";
 const char kDisableNewVirtualKeyboardBehaviorDescription[] =
     "Disable new window behavior for the accessibility keyboard "
     "in non-sticky mode (do not change work area in non-sticky mode).";
 
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace flag_descriptions