Update RecentsCreateView to use RecyclerView.

Move common DirectoryContainerView handling to BaseActivity.

Change-Id: I2c34b23b7050b68999f16e6d7f651c94ea8e47b6
diff --git a/src/com/android/documentsui/DirectoryFragment.java b/src/com/android/documentsui/DirectoryFragment.java
index b30cab6..1a17b6c 100644
--- a/src/com/android/documentsui/DirectoryFragment.java
+++ b/src/com/android/documentsui/DirectoryFragment.java
@@ -102,6 +102,7 @@
 import com.android.documentsui.model.DocumentStack;
 import com.android.documentsui.model.RootInfo;
 import com.android.internal.util.Preconditions;
+
 import com.google.common.collect.Lists;
 
 import java.util.ArrayList;