Naomi Luis 07e8ae7fe4 libhwcomposer: Skip composition if there is no UI update
If we have only one overlay layer, and the rest of the layers
are not updating, set the HWC_SKIP_COMPOSITION flag to inform
SurfaceFlinger not to compose anything. Also skip the drawing of
any UI frames and swapping the buffers.

Change-Id: I2f6554c905756a08880cba531c0210a58396179b
CRs-fixed: 289477
2011-09-19 19:16:36 -05:00
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