Fix tablet layout and resources.

Bug: 10837208
Change-Id: I563a3b66976b5b02cdb25e077bf0709bb6e66926
diff --git a/res/drawable-hdpi/ic_dir_shadow.9.png b/res/drawable-hdpi/ic_dir_shadow.9.png
new file mode 100644
index 0000000..0240874
--- /dev/null
+++ b/res/drawable-hdpi/ic_dir_shadow.9.png
Binary files differ
diff --git a/res/drawable-mdpi/ic_dir_shadow.9.png b/res/drawable-mdpi/ic_dir_shadow.9.png
new file mode 100644
index 0000000..0240874
--- /dev/null
+++ b/res/drawable-mdpi/ic_dir_shadow.9.png
Binary files differ
diff --git a/res/drawable-xxhdpi/ic_dir_shadow.9.png b/res/drawable-xxhdpi/ic_dir_shadow.9.png
new file mode 100644
index 0000000..0240874
--- /dev/null
+++ b/res/drawable-xxhdpi/ic_dir_shadow.9.png
Binary files differ
diff --git a/res/layout-sw720dp/activity.xml b/res/layout-sw720dp/activity.xml
index 584a44d..78735fd 100644
--- a/res/layout-sw720dp/activity.xml
+++ b/res/layout-sw720dp/activity.xml
@@ -44,7 +44,7 @@
         android:layout_weight="1"
         android:orientation="vertical">
 
-        <FrameLayout
+        <com.android.documentsui.DirectoryContainerView
             android:id="@+id/container_directory"
             android:layout_width="match_parent"
             android:layout_height="0dip"