Add --auto-open-devtools-for-tabs flag.

chrome/chrome_debugger.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //chrome/browser/devtools
       'target_name': 'debugger',
       'type': 'static_library',
@@ skipping 67 matching lines @@
             'browser/devtools/device/tcp_device_provider.cc',
             'browser/devtools/device/tcp_device_provider.h',
             'browser/devtools/device/usb/android_rsa.cc',
             'browser/devtools/device/usb/android_rsa.h',
             'browser/devtools/device/usb/android_usb_device.cc',
             'browser/devtools/device/usb/android_usb_device.h',
             'browser/devtools/device/usb/android_usb_socket.cc',
             'browser/devtools/device/usb/android_usb_socket.h',
             'browser/devtools/device/usb/usb_device_provider.cc',
             'browser/devtools/device/usb/usb_device_provider.h',
+            'browser/devtools/devtools_auto_opener.cc',
+            'browser/devtools/devtools_auto_opener.h',
             'browser/devtools/devtools_contents_resizing_strategy.cc',
             'browser/devtools/devtools_contents_resizing_strategy.h',
             'browser/devtools/devtools_embedder_message_dispatcher.cc',
             'browser/devtools/devtools_embedder_message_dispatcher.h',
             'browser/devtools/devtools_file_helper.cc',
             'browser/devtools/devtools_file_helper.h',
             'browser/devtools/devtools_file_system_indexer.cc',
             'browser/devtools/devtools_file_system_indexer.h',
             'browser/devtools/devtools_file_watcher.cc',
             'browser/devtools/devtools_file_watcher.h',
@@ skipping 26 matching lines @@
           'defines': [
             'DEBUG_DEVTOOLS=1',
            ],
         }],
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }