Cleanup Tool WebUI: Add functional HTML and skeleton JS for main content

chrome/browser/resources/cleanup_tool/compiled_resources2.gyp

 # Copyright 2017 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': [
     {
-     'target_name': 'cleanup_browser_proxy',
-     'dependencies': [
-       '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
-     ],
-     'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
+      'target_name': 'cleanup_browser_proxy',
+      'dependencies': [
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
+      ],
+      'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
+    },
+    {
+      'target_name': 'manager',
+      'dependencies': [
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:i18n_behavior',
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:util',
+        '<(DEPTH)/ui/webui/resources/js/cr/compiled_resources2.gyp:ui',
+      ],
+      'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'toolbar',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],
 }