webui: add a gyp file for ui/webui/resources/js/cr/ui and build the pre-compiled

focus_manager.js with it.

R=arv@chromium.org
BUG=393873
NOTRY=true

Review URL: https://codereview.chromium.org/507573002

Cr-Commit-Position: refs/heads/master@{#293590}

third_party/closure_compiler/compiled_resources.gyp

@@ -12,6 +12,7 @@
         '../../chrome/browser/resources/uber/compiled_resources.gyp:*',
         '../../ui/webui/resources/js/chromeos/compiled_resources.gyp:*',
         '../../ui/webui/resources/js/compiled_resources.gyp:*',
+        '../../ui/webui/resources/js/cr/ui/compiled_resources.gyp:*',
       ]
     },
   ]

ui/webui/resources/js/cr/ui/compiled_resources.gyp

+# 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.
+{
+  'targets': [
+    {
+      'target_name': 'focus_manager',
+      'variables': {
+        'depends': [
+          '../../assert.js',
+          '../../cr.js',
+        ],
+      },
+      'includes': ['../../../../../../third_party/closure_compiler/compile_js.gypi'],
+    },
+  ],
+}