am 1cb97eed: check to see if nav cache is up to date on tap

Merge commit '1cb97eed566014e36a7c2a0b487ec132b7d45e6c' into eclair-mr2-plus-aosp

* commit '1cb97eed566014e36a7c2a0b487ec132b7d45e6c':
  check to see if nav cache is up to date on tap