Added test for findbugs plugin.

tools/android/findbugs_plugin/test/run_findbugs_plugin_tests.py

+#!/usr/bin/env python
+#
+# Copyright (c) 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.
+
+# This is used to test the findbugs plugin, it calls
+# build/android/pylib/findbugs.py to analyze the classes in
+# org.chromium.tools.findbugs.plugin package, and expects to get the same
+# issue with those in expected_result.txt.
+#
+# Useful command line:
+# --rebaseline to generate the expected_result.txt, please make sure don't
+# remove the expected result of exsting tests.
+
+
+import optparse
+import os
+import sys
+
+lib_folder = os.path.join(os.getenv('CHROME_SRC'), 'build', 'android', 'pylib')
+if lib_folder not in sys.path:
+  sys.path.append(lib_folder)
+
+import findbugs
+
+
+def main(argv):
+  if not findbugs.CheckEnvironment():
+    return 1
+
+  parser = findbugs.GetCommonParser()
+
+  options, _ = parser.parse_args()
+
+  chrome_src = os.getenv('CHROME_SRC')
+
+  if not options.known_bugs:
+    options.known_bugs = os.path.join(chrome_src, 'tools', 'android',
+                                      'findbugs_plugin', 'test',
+                                      'expected_result.txt')
+  if not options.only_analyze:
+    options.only_analyze = 'org.chromium.tools.findbugs.plugin.*'
+
+  return findbugs.Run(options)
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))