DevTools: use inotify to pick changes on the filesystem.

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("//tools/grit/grit_rule.gni")
 }
 
 action("devtools_protocol_constants") {
   script = "devtools_protocol_constants_generator.py"
@@ skipping 103 matching lines @@
       "device/webrtc/webrtc_device_provider.cc",
       "device/webrtc/webrtc_device_provider.h",
       "devtools_contents_resizing_strategy.cc",
       "devtools_contents_resizing_strategy.h",
       "devtools_embedder_message_dispatcher.cc",
       "devtools_embedder_message_dispatcher.h",
       "devtools_file_helper.cc",
       "devtools_file_helper.h",
       "devtools_file_system_indexer.cc",
       "devtools_file_system_indexer.h",
+      "devtools_file_watcher.cc",
+      "devtools_file_watcher.h",
       "devtools_target_impl.cc",
       "devtools_target_impl.h",
       "devtools_targets_ui.cc",
       "devtools_targets_ui.h",
       "devtools_toggle_action.cc",
       "devtools_toggle_action.h",
       "devtools_ui_bindings.cc",
       "devtools_ui_bindings.h",
       "devtools_window.cc",
       "devtools_window.h",
@@ skipping 11 matching lines @@
     source = "device/webrtc/resources.grd"
     output_dir = "$root_gen_dir/chrome"
     outputs = [
       "grit/webrtc_device_provider_resources.h",
       "grit/webrtc_device_provider_resources_map.cc",
       "grit/webrtc_device_provider_resources_map.h",
       "webrtc_device_provider_resources.pak",
     ]
   }
 }