GTTF: Make checkdeps.py produce JSON output that can be used in a recipe.

tools/checkdeps/checkdeps.py

 #!/usr/bin/env python
 # Copyright 2012 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.
 
 """Makes sure that files include headers from allowed directories.
 
 Checks DEPS files in the source tree for rules, and applies those rules to
 "#include" and "import" directives in the .cpp and .java source files.
 Any source file including something not permitted by the DEPS files will fail.
@@ skipping 168 matching lines @@
       action='store_true', dest='count_violations', default=False,
       help='Count #includes in violation of intended rules.')
   option_parser.add_option(
       '', '--skip-tests',
       action='store_true', dest='skip_tests', default=False,
       help='Skip checking test files (best effort).')
   option_parser.add_option(
       '-v', '--verbose',
       action='store_true', default=False,
       help='Print debug logging')
+  option_parser.add_option(
+      '', '--json',
+      help='Path to JSON output file')
   options, args = option_parser.parse_args()
 
   deps_checker = DepsChecker(options.base_directory,
                              verbose=options.verbose,
                              ignore_temp_rules=options.ignore_temp_rules,
                              skip_tests=options.skip_tests)
 
   # Figure out which directory we have to check.
   start_dir = deps_checker.base_directory
   if len(args) == 1:
     # Directory specified. Start here. It's supposed to be relative to the
     # base directory.
     start_dir = os.path.abspath(
         os.path.join(deps_checker.base_directory, args[0]))
   elif len(args) >= 2 or (options.generate_temp_rules and
                           options.count_violations):
     # More than one argument, or incompatible flags, we don't handle this.
     PrintUsage()
     return 1
 
   print 'Using base directory:', deps_checker.base_directory
   print 'Checking:', start_dir
 
   if options.generate_temp_rules:
     deps_checker.results_formatter = results.TemporaryRulesFormatter()
   elif options.count_violations:
     deps_checker.results_formatter = results.CountViolationsFormatter()
+
+  if options.json:
+    deps_checker.results_formatter = results.JSONResultsFormatter(
+        options.json, deps_checker.results_formatter)
+
   deps_checker.CheckDirectory(start_dir)
   return deps_checker.Report()
 
 
 if '__main__' == __name__:
   sys.exit(main())