Port downloads.ItemView to a Polymer component.

chrome/browser/resources/md_downloads/compiled_resources2.gyp

 # Copyright 2015 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': 'item_view',
+      'dependencies': [
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
+        '../downloads/compiled_resources2.gyp:constants',
+        '../downloads/compiled_resources2.gyp:throttled_icon_loader',
+        '../downloads/compiled_resources2.gyp:externs',
+      ],
+      'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
+    },
+    {
       'target_name': 'manager',
       'dependencies': [
-        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:action_link',
-        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:assert',
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
-        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:util',
         '<(DEPTH)/ui/webui/resources/js/cr/compiled_resources2.gyp:ui',
         '<(DEPTH)/ui/webui/resources/js/cr/ui/compiled_resources2.gyp:command',
+        'item_view',
         '<(EXTERNS_GYP):chrome_send',
         '../downloads/compiled_resources2.gyp:externs',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],
 }