Add keyboard shadow

This CL sets 8dp elevation ot input view in order to cast a shadow
onto underlying application.

Bug: 16210054
Change-Id: I7779c63612fc88e24dde65de3e4e7a45b9d1762f
diff --git a/java/res/layout/input_view.xml b/java/res/layout/input_view.xml
index 46551f6..ae3c19d 100644
--- a/java/res/layout/input_view.xml
+++ b/java/res/layout/input_view.xml
@@ -21,7 +21,8 @@
 <com.android.inputmethod.latin.InputView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content">
+    android:layout_height="wrap_content"
+    style="?attr/inputViewStyle">
     <include
         android:id="@+id/main_keyboard_frame"
         layout="@layout/main_keyboard_frame" />