Adding a scrollable folder content implementation

> Size is restricted to 3x3 for now
> Drag-drop across page s not implemented yet
> A-Z sorting is not implemented yet

Change-Id: I84328caa6ad910d1edeeac6f3a7fb61b7292ea7e

src/com/android/launcher3/FolderCellLayout.java

@@ -1,3 +1,19 @@
+/**
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.android.launcher3;
 
 import android.content.Context;
@@ -138,6 +154,11 @@ public class FolderCellLayout extends CellLayout implements Folder.FolderContent
         addViewToCellLayout(view, -1, mFolder.mLauncher.getViewIdForItem(item), lp, true);
     }
 
+    @Override
+    public void removeItem(View v) {
+        removeView(v);
+    }
+
     /**
      * Updates the item cellX and cellY position
      */