[ActivityManager] Skip receiver precisely.

Symptom:
Report broadcast ANR on a dead process.

Detail and sample:
http://code.google.com/p/android/issues/detail?id=158329

Root cause:
app.curReceiver can only remember the last running.
If an application is both receiving FG and BG broadcast,
only one of queue can discard, the remain one will still
count as timeout.

Solution:
Select the skip-tartget-receiver by comparing the skipping app
to the first record of mOrderedBroadcasts of each broadcast queues.

Change-Id: Ic68d56f21b417a34f2d30d64ecfbed09c5e1764d