Hide the workspace when launching AllApps2D.

Boosts performance and squashes some weird focus issues.

(Also: fix builds with AllApps3D)

Change-Id: Id1c4628e119c950dced9d3383993674f3d6b9a1c
diff --git a/src/com/android/launcher2/AllAppsView.java b/src/com/android/launcher2/AllAppsView.java
index 46f1d34..01a6df4 100644
--- a/src/com/android/launcher2/AllAppsView.java
+++ b/src/com/android/launcher2/AllAppsView.java
@@ -51,6 +51,10 @@
 
 
 public interface AllAppsView {
+    public interface Watcher {
+        public void zoomed(float zoom);
+    };
+
     public void setLauncher(Launcher launcher);
 
     public void setDragController(DragController dragger);