Adding a progress bar while All Apps is loading

- also, removing some unused imports

Change-Id: Icf46beb9fa9d89bc06cba33c148ceb7d668cd402
diff --git a/src/com/android/launcher2/LauncherModel.java b/src/com/android/launcher2/LauncherModel.java
index 206de14..c46e175 100644
--- a/src/com/android/launcher2/LauncherModel.java
+++ b/src/com/android/launcher2/LauncherModel.java
@@ -644,6 +644,10 @@
         }
     }
 
+    public boolean isAllAppsLoaded() {
+        return mAllAppsLoaded;
+    }
+
     /**
      * Runnable for the thread that loads the contents of the launcher:
      *   - workspace icons