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Adds a source variance computation function
Deb Mukherjee authored
Adds a function to compute source variance for various
sb_types to be used for pruning mode and partition searches.
[The existing activity measure function is currently specialized
for only 16x16 MBs and needs to be updated].

Change-Id: I22a41e6f1430184201487326fdbebb9b47e6fc24
dbea726d