Merge pull request #477 from abarth/reprojection

Reduce paint time for Stocks drawer animation by 88%

packages/flutter/lib/src/material/drawer.dart

@@ -202,11 +202,13 @@ class _DrawerControllerState extends State<_DrawerController> {
               widthFactor: _performance.progress,
               child: new SizeObserver(
                 onSizeChanged: _handleSizeChanged,
+                child: new ForcedLayer(
                   child: config.child
                 )
               )
             )
           )
+        )
       ])
     );
   }