[MD Bookmarks] Fix JS closure compile for paper-toast.

third_party/closure_compiler/compile2.py

 #!/usr/bin/python
 # 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.
 
 """Runs Closure compiler on JavaScript files to check for errors and produce
 minified output."""
 
 import argparse
 import os
@@ skipping 220 matching lines @@
     process_includes = custom_includes or not custom_sources
     if process_includes:
       # TODO(dbeam): compiler.jar automatically detects "@externs" in a --js arg
       # and moves these files to a different AST tree. However, because we use
       # one big funky <include> meta-file, it thinks all the code is one big
       # externs. Just use --js when <include> dies.
 
       cwd, tmp_dir = os.getcwd(), tempfile.gettempdir()
       rel_path = lambda f: os.path.join(os.path.relpath(cwd, tmp_dir), f)
       contents = ['<include src="%s">' % rel_path(f) for f in js_args]
-      meta_file = self._create_temp_file("\n".join(contents))
+      meta_file = self._create_temp_file("\n/** */\n".join(contents))
       self._log_debug("Meta file: %s" % meta_file)
 
       self._processor = processor.Processor(meta_file)
       self._expanded_file = self._create_temp_file(self._processor.contents)
       self._log_debug("Expanded file: %s" % self._expanded_file)
 
       js_args = [self._expanded_file]
 
     closure_args = closure_args or []
     closure_args += ["summary_detail_level=3", "continue_after_errors"]
@@ skipping 79 matching lines @@
 
   found_errors, stderr = checker.check(opts.sources, out_file=opts.out_file,
                                        closure_args=opts.closure_args,
                                        custom_sources=opts.custom_sources,
                                        custom_includes=opts.custom_includes)
 
   if found_errors:
     if opts.custom_sources:
       print stderr
     sys.exit(1)