Don't swallow "aapt crunch" build errors.

build/android/gyp/process_resources.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.
 
 """Process Android library resources to generate R.java and crunched images."""
 
 import optparse
 import os
@@ skipping 95 matching lines @@
     package_command += ['--custom-package', options.custom_package]
   build_utils.CheckCallDie(package_command)
 
   # Crunch image resources. This shrinks png files and is necessary for 9-patch
   # images to display correctly.
   build_utils.MakeDirectory(options.crunch_output_dir)
   aapt_cmd = [aapt,
               'crunch',
               '-S', options.crunch_input_dir,
               '-C', options.crunch_output_dir]
-  build_utils.CheckCallDie(aapt_cmd, suppress_output=True)
+  build_utils.CheckCallDie(aapt_cmd, suppress_output=True, fail_if_stderr=True)
 
   MoveImagesToNonMdpiFolders(options.crunch_output_dir)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   main()