Add a presubmit check to check that a certain set of Android specific files only have deletions.

build/android/PRESUBMIT.py

 # Copyright (c) 2013 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.
 
 """Presubmit script for android buildbot.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
 details on the presubmit API built into gcl.
 """
 
+_DELETIONS_ONLY_FILES = (
+    'build/android/findbugs_filter/findbugs_known_bugs.txt',
+)
+
+
+def _CheckDeletionsOnlyFiles(input_api, output_api):
+  """Check that a certain listed files only have deletions.
+  """
+  errors = []
+  for f in input_api.AffectedFiles():
+    if f.LocalPath() in _DELETIONS_ONLY_FILES:
+      if f.ChangedContents():
+        errors.append(f.LocalPath())
+  results = []
+  if errors:
+    results.append(output_api.PresubmitError(
+        'Following files should only contain deletions.', errors))
+  return results
+
+
 def CommonChecks(input_api, output_api):
   output = []
 
   def J(*dirs):
     """Returns a path relative to presubmit directory."""
     return input_api.os_path.join(input_api.PresubmitLocalPath(), *dirs)
 
   output.extend(input_api.canned_checks.RunPylint(
       input_api,
       output_api,
       white_list=[r'PRESUBMIT\.py$', r'buildbot/.*\.py$'],
       extra_paths_list=[
           J(), J('..', '..', 'third_party', 'android_testrunner')]))
 
   output.extend(input_api.canned_checks.RunUnitTestsInDirectory(
       input_api, output_api, J('buildbot', 'tests')))
+  output.extend(_CheckDeletionsOnlyFiles(input_api, output_api))
   return output
 
 
 def CheckChangeOnUpload(input_api, output_api):
   return CommonChecks(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
   return CommonChecks(input_api, output_api)