am 8e4a110b: Merge change I5469a4ac into eclair

Merge commit '8e4a110b3e146b30b804d7e2cd0825bf56bd7d0f' into eclair-plus-aosp

* commit '8e4a110b3e146b30b804d7e2cd0825bf56bd7d0f':
  fixed [2260070] display stopped updating

libs/surfaceflinger/Layer.cpp

@@ -515,6 +515,11 @@ void Layer::unlockPageFlip(
         dirtyRegion.andSelf(visibleRegionScreen);
         outDirtyRegion.orSelf(dirtyRegion);
     }
+    if (visibleRegionScreen.isEmpty()) {
+        // an invisible layer should not hold a freeze-lock
+        // (because it may never be updated and thereore never release it)
+        mFreezeLock.clear();
+    }
 }
 
 void Layer::finishPageFlip()