Jeff Brown 9eb7d86181 Make velocity tracker strategy configurable.
This change is very useful for testing purposes because it makes it
easy to compare different implementations to see how they behave.

There is no change to the current default strategy.

Bug: 6413587
Change-Id: I4d8567aa4160571ba9fa397ce419882cd9366749
2012-06-03 19:21:49 -07:00
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