Remove skydb dependency on build/android/pylib

sky/tools/android_library_cacher.py

Index: sky/tools/android_library_cacher.py
diff --git a/sky/tools/android_library_cacher.py b/sky/tools/android_library_cacher.py
index 5cedc1985ebc5fa0fb096a4864b0c923e1213a70..db80d18cf13bd6eabbab2d5b194b55f93015e82d 100755
--- a/sky/tools/android_library_cacher.py
+++ b/sky/tools/android_library_cacher.py
@@ -10,6 +10,10 @@ 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():
@@ -23,14 +27,14 @@ def main():
     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]:
@@ -53,7 +57,7 @@ def main():
         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)