[DevTools] Split device discovery off DevToolsAnrdoidBridge.

chrome/browser/devtools/BUILD.gn

 # 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.
 
 if (!is_android) {
   import("//build/config/features.gni")
   import("//chrome/common/features.gni")
   import("//tools/grit/grit_rule.gni")
 }
 
@@ skipping 73 matching lines @@
       "device/adb/adb_client_socket.cc",
       "device/adb/adb_client_socket.h",
       "device/adb/adb_device_provider.cc",
       "device/adb/adb_device_provider.h",
       "device/android_device_info_query.cc",
       "device/android_device_manager.cc",
       "device/android_device_manager.h",
       "device/android_web_socket.cc",
       "device/devtools_android_bridge.cc",
       "device/devtools_android_bridge.h",
+      "device/devtools_device_discovery.cc",
+      "device/devtools_device_discovery.h",
       "device/port_forwarding_controller.cc",
       "device/port_forwarding_controller.h",
       "device/tcp_device_provider.cc",
       "device/tcp_device_provider.h",
       "device/usb/android_rsa.cc",
       "device/usb/android_rsa.h",
       "device/usb/android_usb_device.cc",
       "device/usb/android_usb_device.h",
       "device/usb/android_usb_socket.cc",
       "device/usb/android_usb_socket.h",
@@ skipping 25 matching lines @@
       "remote_debugging_server.h",
     ]
     if (enable_service_discovery) {
       sources += [
         "device/cast_device_provider.cc",
         "device/cast_device_provider.h",
       ]
     }
   }
 }