StretchEffect changes

Bug: 179047472
Test: StretchySurfaceViewActivity in HwAccelerationTests
Change-Id: Ia1fcd6136a380bb7099fae08ceb024eae4f79ac8
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 687f473..f87aec2 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -943,6 +943,7 @@
     bool backpressureEnabled() { return mDrawingState.flags & layer_state_t::eEnableBackpressure; }
 
     bool setStretchEffect(const StretchEffect& effect);
+    StretchEffect getStretchEffect() const;
 
 protected:
     class SyncPoint {