GitLab

- starting at app onCreate() is about 6 seconds before BOOT_COMPLETE
- enable hardware immediately, but do not send any intents until
  BOOT_COMPLETE (using mBootComplete to guard).
- add mutex's around some fields that needed it

The fields that are still not thread-safe were non-trivial to fix.

Change-Id: Id1c2bf535610ac594a33d84fe9a32d01d698a321
Signed-off-by: Nick Pelly <npelly@google.com>