register_proc in HWC is used by SurfaceFlinger to register callback functions with HWC. This can be used by HWC to invoke SurfaceFlinger functions. Currently invalidate is the only function registerd and can be used by HWC to trigger a screen re-draw. CRs-Fixed: 342060 (cherry picked from commit 03a5cf4b9c52da2bfbd9706e85fddae63110ee9b) Change-Id: I464370ebf63b93e0ce238395b5c165647d777575
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