Remove skydb dependency on build/android/pylib

sky/tools/android_library_cacher.py

 #!/usr/bin/env python
 # Copyright 2015 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 argparse
 import re
 import sys
 import os
 import logging
 import subprocess
 
+SRC_ROOT = skypy.paths.Paths('ignored').src_root
+ADB_PATH = os.path.join(SRC_ROOT,
+    'third_party/android_tools/sdk/platform-tools/adb')
+
 
 # TODO(eseidel): This should be shared with adb_gdb
 def main():
     logging.basicConfig(level=logging.INFO)
     parser = argparse.ArgumentParser(
         description='Pull all libraries used by a pid on android into a cache.')
     parser.add_argument('cache_root', type=str)
     parser.add_argument('pid', type=int)
     args = parser.parse_args()
 
     if not os.path.exists(args.cache_root):
         os.makedirs(args.cache_root)
 
-    subprocess.check_call(['adb', 'root'])
+    subprocess.check_call([ADB_PATH, 'root'])
 
     # TODO(eseidel): Check the build.props, or find some way to avoid
     # re-pulling every library every time.  adb_gdb has code to do this
     # but doesn't seem to notice when the set of needed libraries changed.
 
     library_regexp = re.compile(r'(?P<library_path>/system/.*\.so)')
-    cat_maps_cmd = ['adb', 'shell', 'cat', '/proc/%s/maps' % args.pid]
+    cat_maps_cmd = [ADB_PATH, 'shell', 'cat', '/proc/%s/maps' % args.pid]
     maps_lines = subprocess.check_output(cat_maps_cmd).strip().split('\n')
     # adb shell doesn't return the return code from the shell?
     if not maps_lines or 'No such file or directory' in maps_lines[0]:
         print 'Failed to get maps for pid %s on device.' % args.pid
         sys.exit(1)
 
     def library_from_line(line):
         result = library_regexp.search(line)
         if not result:
             return None
         return result.group('library_path')
 
     dev_null = open(os.devnull, 'w')  # Leaking.
     to_pull = set(filter(None, map(library_from_line, maps_lines)))
     to_pull.add('/system/bin/linker')  # Unclear why but adb_gdb pulls this too.
     for library_path in sorted(to_pull):
         # Not using os.path.join since library_path is absolute.
         dest_file = os.path.normpath("%s/%s" % (args.cache_root, library_path))
         dest_dir = os.path.dirname(dest_file)
         if not os.path.exists(dest_dir):
             os.makedirs(dest_dir)
         print '%s -> %s' % (library_path, dest_file)
-        pull_cmd = ['adb', 'pull', library_path, dest_file]
+        pull_cmd = [ADB_PATH, 'pull', library_path, dest_file]
         subprocess.check_call(pull_cmd, stderr=dev_null)
 
 
 if __name__ == '__main__':
     main()