Introduce "StrictMode"

This is a new public API for developers to opt-in to strict rules
about what they're allowed to do on certain threads.  (this is the
public face of the @hide dalvik.system.BlockGuard, added recently...)

In practice this will be used for developers to opt-in to declaring
that they don't want to be allowed to do various operations (such as
disk I/O or network operations) on their main UI threads.  (these
operations are often accidental, or even when they are fast come with
a good chance of being slow or very slow in some cases....)

Implementation wise, this is just a thread-local integer that has a
bitmask of the things that aren't allowed, and more bits for saying
what the violation penalty is.  The penalties, of which multiple can
be chosen, include:

  * logging
  * dropbox uploading for analysis/reporting
  * annoying dialog
  * full-on crashing

These are all only very roughly implemented at this point, but all
parts now minimally work end-to-end now, so this is a good checkpoint
commit before this gets too large.

Future CLs will polish all the above 4 penalties, including
checksumming of stacktraces and minimizing penalties for duplicate
violations.

Change-Id: Icbe61a2e950119519e7364030b10c3c28d243abe

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