Merge "Fix DocumentsUI animation regression." into mnc-dev

packages/DocumentsUI/res/layout-sw720dp/activity.xml

@@ -55,6 +55,7 @@
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:orientation="vertical"
+            android:background="@color/material_grey_50"
             android:elevation="8dp">
 
             <com.android.documentsui.DirectoryContainerView
@@ -67,6 +68,7 @@
                 android:id="@+id/container_save"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
+                android:background="@color/material_grey_50"
                 android:elevation="8dp" />
 
         </LinearLayout>

packages/DocumentsUI/res/layout/activity.xml

@@ -51,6 +51,7 @@
             android:id="@+id/container_save"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
+            android:background="@color/material_grey_50"
             android:elevation="8dp" />
 
     </LinearLayout>

packages/DocumentsUI/res/layout/fragment_directory.xml

@@ -16,7 +16,8 @@
 
 <com.android.documentsui.DirectoryView xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="@color/material_grey_50">
 
     <TextView
         android:id="@android:id/empty"

packages/DocumentsUI/res/values/colors.xml

@@ -15,6 +15,7 @@
 -->
 
 <resources>
+    <color name="material_grey_50">#fffafafa</color>
     <color name="material_grey_300">#ffeeeeee</color>
 
     <color name="item_doc_grid_background">@color/material_grey_300</color>