DevTools: extract the dom_extension module.

third_party/WebKit/Source/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.
 
 import("//build/config/features.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
 all_devtools_files = [
   "front_end/accessibility/AccessibilityModel.js",
@@ skipping 146 matching lines @@
   "front_end/css_tracker/cssTrackerView.css",
   "front_end/css_tracker/CSSTrackerView.js",
   "front_end/css_tracker/module.json",
   "front_end/css_tracker/unusedRulesTree.css",
   "front_end/devices/devicesView.css",
   "front_end/devices/DevicesView.js",
   "front_end/devices/module.json",
   "front_end/diff/diff_match_patch.js",
   "front_end/diff/Diff.js",
   "front_end/diff/module.json",
+  "front_end/dom_extension/DOMExtension.js",
+  "front_end/dom_extension/module.json",
   "front_end/elements/breadcrumbs.css",
   "front_end/elements/ClassesPaneWidget.js",
   "front_end/elements/ColorSwatchPopoverIcon.js",
   "front_end/elements/ComputedStyleModel.js",
   "front_end/elements/computedStyleSidebarPane.css",
   "front_end/elements/ComputedStyleWidget.js",
   "front_end/elements/ElementsBreadcrumbs.js",
   "front_end/elements/elementsPanel.css",
   "front_end/elements/ElementsPanel.js",
   "front_end/elements/ElementsSidebarPane.js",
@@ skipping 386 matching lines @@
   "front_end/ui/closeButton.css",
   "front_end/ui/colorSwatch.css",
   "front_end/ui/ColorSwatch.js",
   "front_end/ui/Context.js",
   "front_end/ui/ContextMenu.js",
   "front_end/ui/cssShadowEditor.css",
   "front_end/ui/CSSShadowEditor.js",
   "front_end/ui/cssShadowSwatch.css",
   "front_end/ui/dialog.css",
   "front_end/ui/Dialog.js",
-  "front_end/ui/DOMExtension.js",
   "front_end/ui/DOMSyntaxHighlighter.js",
   "front_end/ui/DropDownMenu.js",
   "front_end/ui/dropTarget.css",
   "front_end/ui/DropTarget.js",
   "front_end/ui/emptyWidget.css",
   "front_end/ui/EmptyWidget.js",
   "front_end/ui/filter.css",
   "front_end/ui/FilterBar.js",
   "front_end/ui/ForwardedInputEventHandler.js",
   "front_end/ui/HistoryInput.js",
@@ skipping 473 matching lines @@
     ".eslintrc.js",
     "devtools-node-modules/",
     "front_end/",
     "scripts/buildbot/run_eslint.py",
     "scripts/local_node/",
     "//testing/scripts/common.py",
     "//testing/scripts/run_devtools_check.py",
     "//testing/xvfb.py",
   ]
 }