Build ChromeVox using gyp.

chrome/browser/resources/chromeos/chromevox/copy_js.gypi

+# 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.
+
+# Include this file in a target to copy all necessary files to satisfy
+# the transitive dependencies of a set of top-level JavaScript files
+# using closure-style dependency declarations.  The following variables
+# must be available when this file is included:
+# js_root_flags: List of '-r' flags to jsbundler.py for locating the
+#   .js files.
+# path_rewrite_flags: '-w' flags to jsbundler.py to replace source path
+#   prefixes at the destination.
+# dest_dir: Destination directory for all copied files.
+
+{
+  'actions': [
+    {
+      'action_name': 'copy_js',
+      'message': 'Copy JS for <(_target_name)',
+      'variables': {
+        'js_files': [
+          '<!@(python tools/jsbundler.py <(js_root_flags) <(_sources))'
+        ],
+      },
+      'inputs': [
+        'tools/jsbundler.py',
+        '<@(js_files)',
+      ],
+      'outputs': [
+        '<!@(python tools/jsbundler.py <@(path_rewrite_flags) -d <(dest_dir) <@(js_files))'
+      ],
+      'action': [
+        'python',
+        'tools/jsbundler.py',
+        '-m', 'copy',
+        '-d', '<(dest_dir)',
+        '<@(path_rewrite_flags)',
+        '<@(js_files)',
+      ],
+    },
+  ]
+}