Navigation fix for 10-inch tablets with keyboard

Added proper asset for dropdown list so that focused state is correct.

Bug:5071639
Change-Id: I26b6f838294d502053fa36f825c6745b6560bc52
diff --git a/res/drawable/ab_dropdown_navigation_item_background.xml b/res/drawable/ab_dropdown_navigation_item_background.xml
index c144996..05fa704 100644
--- a/res/drawable/ab_dropdown_navigation_item_background.xml
+++ b/res/drawable/ab_dropdown_navigation_item_background.xml
@@ -17,5 +17,7 @@
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_pressed="true"
         android:drawable="@drawable/ab_dropdown_navigation_item_background_pressed"/>
+    <item android:state_focused="true"
+        android:drawable="@drawable/ab_dropdown_navigation_item_background_focused"/>
     <item android:drawable="@drawable/spinner_default_holo_dark" />
 </selector>
diff --git a/res/drawable/ab_dropdown_navigation_item_background_focused.xml b/res/drawable/ab_dropdown_navigation_item_background_focused.xml
new file mode 100644
index 0000000..a1dad59
--- /dev/null
+++ b/res/drawable/ab_dropdown_navigation_item_background_focused.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2012 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.
+-->
+
+<layer-list
+    xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:drawable="@drawable/action_bar_item_focused" />
+    <item android:drawable="@drawable/spinner_default_holo_dark" />
+</layer-list>