[Android] Print out the command used to run findbugs.

Start printing out the command used to run findbugs to allow for easier
debugging why findbugs might be failing.

BUG=None

Review URL: https://codereview.chromium.org/612883006

Cr-Commit-Position: refs/heads/master@{#297463}

build/android/pylib/utils/findbugs.py

@@ -144,6 +144,13 @@ def _Run(exclude, known_bugs, classes_to_analyze, auxiliary_classes,
     return 1
   cmd = '%s %s ' % (cmd, chrome_classes)
 
+  print
+  print '*' * 80
+  print 'Command used to run findbugs:'
+  print cmd
+  print '*' * 80
+  print
+
   proc = subprocess.Popen(shlex.split(cmd),
                           stdout=subprocess.PIPE, stderr=subprocess.PIPE)
   out, _err = proc.communicate()