Fix up proguard output filtering

build/android/gyp/proguard.py

 #!/usr/bin/env python
 #
 # Copyright 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.
 
 import optparse
 import os
 import sys
 
@@ skipping 13 matching lines @@
                     help='Paths to proguard configuration files.')
   parser.add_option('--mapping', help='Path to proguard mapping to apply.')
   parser.add_option('--is-test', action='store_true',
       help='If true, extra proguard options for instrumentation tests will be '
       'added.')
   parser.add_option('--tested-apk-info', help='Path to the proguard .info file '
       'for the tested apk')
   parser.add_option('--classpath', action='append',
                     help='Classpath for proguard.')
   parser.add_option('--stamp', help='Path to touch on success.')
+  parser.add_option('--verbose', '-v', action='store_true',
+                    help='Print all proguard output')
 
   options, _ = parser.parse_args(args)
 
   classpath = []
   for arg in options.classpath:
     classpath += build_utils.ParseGypList(arg)
   options.classpath = classpath
 
   return options
 
@@ skipping 12 matching lines @@
 
   if options.tested_apk_info:
     proguard.tested_apk_info(options.tested_apk_info)
 
   classpath = list(set(options.classpath))
   proguard.libraryjars(classpath)
 
   input_paths = proguard.GetInputs()
 
   build_utils.CallAndWriteDepfileIfStale(
-      proguard.CheckOutput,
+      lambda: proguard.CheckOutput(options.verbose),
       options,
       input_paths=input_paths,
       input_strings=proguard.build(),
       output_paths=[options.output_path])
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))