DevTools: Create target per each worker behind experiment

Source/devtools/devtools.gypi

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 167 matching lines @@
             'front_end/UISourceCode.js',
             'front_end/UIString.js',
             'front_end/UIUtils.js',
             'front_end/UserMetrics.js',
             'front_end/utilities.js',
             'front_end/View.js',
             'front_end/ViewportControl.js',
             'front_end/WebInspector.js',
             'front_end/WorkerManager.js',
             'front_end/WorkerFrontendManager.js',
+            'front_end/WorkerTargetManager.js',
             'front_end/Workspace.js',
             'front_end/WorkspaceController.js',
             'front_end/ZoomManager.js',
             'front_end/dialog.css',
             'front_end/inspector.css',
             'front_end/tabbedPane.css',
             'front_end/inspectorSyntaxHighlight.css',
             'front_end/modules.js',
             'front_end/popover.css',
             '<@(devtools_modules_js_files)',
@@ skipping 278 matching lines @@
             'front_end/TempStorageSharedWorker.js',
         ],
         'devtools_script_formatter_worker_js_files': [
             'front_end/CSSFormatter.js',
             'front_end/JavaScriptFormatter.js',
             'front_end/ScriptFormatterWorker.js',
             'front_end/utilities.js',
         ],
     },
 }