Make drag shadow work across entire layout

Move drag shadow view into main layout so that it can be drawn
over all other views.

Also offset it accordingly based on its parent's X/Y coordinates

Bug: 14393052
Change-Id: I957469cf505d30812b539517d2aeab3f72a733ca
diff --git a/res/layout/dialtacts_activity.xml b/res/layout/dialtacts_activity.xml
index e4e2a23..90b66fd 100644
--- a/res/layout/dialtacts_activity.xml
+++ b/res/layout/dialtacts_activity.xml
@@ -102,4 +102,15 @@
             android:src="@drawable/ic_dial_action_call"
             android:visibility="gone" />
     </FrameLayout>
+    <!-- Host container for the contact tile drag shadow -->
+    <FrameLayout
+        android:layout_height="match_parent"
+        android:layout_width="match_parent">
+        <ImageView
+            android:id="@+id/contact_tile_drag_shadow_overlay"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:visibility="gone"
+            android:importantForAccessibility="no" />
+    </FrameLayout>
 </RelativeLayout>