Hung-ying Tyan 9edfa10757 Keep last known keepalive interval to avoid duplicate effort.
The current implementation always starts with default minimum interval when
the measurement process starts. By keeping last known good interval, we can
save the time in re-measurement.

Change-Id: I8f1720acafaa7e101855fe0c66d5c7b0e578e0d7
2011-07-01 21:20:36 +08:00
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