Have VirtualDisplays send SF resize messages when resizing

Change-Id: I76d15b22099a659450ec875836c9bf2b6584838f
diff --git a/include/private/gui/LayerState.h b/include/private/gui/LayerState.h
index 5584fb1..2fa6ff9 100644
--- a/include/private/gui/LayerState.h
+++ b/include/private/gui/LayerState.h
@@ -113,7 +113,8 @@
     enum {
         eSurfaceChanged             = 0x01,
         eLayerStackChanged          = 0x02,
-        eDisplayProjectionChanged   = 0x04
+        eDisplayProjectionChanged   = 0x04,
+        eDisplaySizeChanged         = 0x08
     };
 
     uint32_t what;
@@ -123,6 +124,7 @@
     uint32_t orientation;
     Rect viewport;
     Rect frame;
+    uint32_t width, height;
     status_t write(Parcel& output) const;
     status_t read(const Parcel& input);
 };