Added --enable-ui-devtools to chrome://flags.

chrome/browser/flag_descriptions.h

 // 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.
 
 #ifndef CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 #define CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 
 // Includes needed for macros allowing conditional compilation of some strings.
 #include "build/build_config.h"
 #include "build/buildflag.h"
@@ skipping 1330 matching lines @@
 
 extern const char kTeamDrivesName[];
 extern const char kTeamDrivesDescription[];
 
 extern const char kTetherName[];
 extern const char kTetherDescription[];
 
 extern const char kTouchscreenCalibrationName[];
 extern const char kTouchscreenCalibrationDescription[];
 
+extern const char kUiDevToolsName[];
+extern const char kUiDevToolsDescription[];
+
 extern const char kUseMusName[];
 extern const char kUseMusDescription[];
 extern const char kEnableMashDescription[];
 extern const char kEnableMusDescription[];
 
 extern const char kVideoPlayerChromecastSupportName[];
 extern const char kVideoPlayerChromecastSupportDescription[];
 
 extern const char kVirtualKeyboardName[];
 extern const char kVirtualKeyboardDescription[];
@@ skipping 136 matching lines @@
 #endif  // defined(TOOLKIT_VIEWS) || defined(OS_ANDROID)
 
 // ============================================================================
 // Don't just add flags to the end, put them in the right section in
 // alphabetical order. See top instructions for more.
 // ============================================================================
 
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_