Merge from ics-mr0

class APK(object):

  def __init__(self, full_filename, filename):

    self.filename = filename

    self.certs = set()

    Push(filename+":")

    try:

      self.RecordCert(full_filename)

      self.RecordCerts(full_filename)

      self.ReadManifest(full_filename)

    finally:

      Pop()

  def RecordCert(self, full_filename):

  def RecordCerts(self, full_filename):

    out = set()

    try:

      f = open(full_filename)

      apk = zipfile.ZipFile(f, "r")

           (info.filename.endswith(".DSA") or info.filename.endswith(".RSA")):

          pkcs7 = apk.read(info.filename)

          cert = CertFromPKCS7(pkcs7, info.filename)

          self.certs.add(cert)

          out.add(cert)

          ALL_CERTS.Add(cert)

      if not pkcs7:

        AddProblem("no signature")

    finally:

      f.close()

      self.certs = frozenset(out)

  def ReadManifest(self, full_filename):

    p = common.Run(["aapt", "dump", "xmltree", full_filename,