liboverlay: Rotator-assisted MDP downscaling of videos.

Engage the rotator to assist MDP in performing video downscale for
primary and external. This saves bandwidth and avoids causing the
driver to make too many panel mode switches between BLT (writeback)
and non-BLT (direct) modes.

Change-Id: Icfabc2c0f978a23cf96c78a9976cf69cea697b5f
CRs-Fixed: 434852
diff --git a/liboverlay/overlayMdssRot.cpp b/liboverlay/overlayMdssRot.cpp
index b0f51c1..c00e732 100644
--- a/liboverlay/overlayMdssRot.cpp
+++ b/liboverlay/overlayMdssRot.cpp
@@ -95,11 +95,14 @@
     mBufSize = awhf.size;
 }
 
+void MdssRot::setDownscale(int ds) {
+}
+
 void MdssRot::setFlags(const utils::eMdpFlags& flags) {
     mRotInfo.flags |= flags;
 }
 
-void MdssRot::setTransform(const utils::eTransform& rot, const bool& rotUsed)
+void MdssRot::setTransform(const utils::eTransform& rot)
 {
     int flags = utils::getMdpOrient(rot);
     if (flags != -1)
@@ -108,7 +111,9 @@
     //Clients in Android dont factor in 90 rotation while deciding the flip.
     mOrientation = static_cast<utils::eTransform>(flags);
     ALOGE_IF(DEBUG_OVERLAY, "%s: rot=%d", __FUNCTION__, flags);
+}
 
+void MdssRot::setRotatorUsed(const bool& rotUsed) {
     setDisable();
     if(rotUsed) {
         setEnable();