we were not always clearing the screen properly

Change-Id: I269dd866e965aebd9b3c4667095818202982f4a3
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index f0af3d6..50fef00 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -367,7 +367,8 @@
             const Region& dirty);
 
     void postFramebuffer();
-    void drawWormhole(const Region& region) const;
+    void drawWormhole(const sp<const DisplayDevice>& hw,
+            const Region& region) const;
     GLuint getProtectedTexName() const {
         return mProtectedTexName;
     }