[Android] Prepare build/android/ for catapult+devil.

build/android/asan_symbolize.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 collections
 import optparse
 import os
 import re
 import sys
 
-from pylib import constants
+from pylib.constants import host_paths
 
 # Uses symbol.py from third_party/android_platform, not python's.
-sys.path.insert(0,
-                os.path.join(constants.DIR_SOURCE_ROOT,
-                            'third_party/android_platform/development/scripts'))
-import symbol
+with host_paths.SysPath(
+    host_paths.ANDROID_PLATFORM_DEVELOPMENT_SCRIPTS_PATH,
+    position=0):
+  import symbol
 
 
 _RE_ASAN = re.compile(r'(.*?)(#\S*?) (\S*?) \((.*?)\+(.*?)\)')
 
 def _ParseAsanLogLine(line):
   m = re.match(_RE_ASAN, line)
   if not m:
     return None
   return {
       'prefix': m.group(1),
       'library': m.group(4),
       'pos': m.group(2),
       'rel_address': '%08x' % int(m.group(5), 16),
   }
 
 
 def _FindASanLibraries():
-  asan_lib_dir = os.path.join(constants.DIR_SOURCE_ROOT,
+  asan_lib_dir = os.path.join(host_paths.DIR_SOURCE_ROOT,
                               'third_party', 'llvm-build',
                               'Release+Asserts', 'lib')
   asan_libs = []
   for src_dir, _, files in os.walk(asan_lib_dir):
     asan_libs += [os.path.relpath(os.path.join(src_dir, f))
                   for f in files
                   if f.endswith('.so')]
   return asan_libs
 
 
@@ skipping 47 matching lines @@
   options, _ = parser.parse_args()
   if options.logcat:
     asan_input = file(options.logcat, 'r')
   else:
     asan_input = sys.stdin
   _Symbolize(asan_input.readlines())
 
 
 if __name__ == "__main__":
   sys.exit(main())