Disable accessibility focus on the instruction video in magnification
gesture screen.

Test: Manually built and tested with Bullhead
Bug: 30898790
Change-Id: I399e2b9be33ebf6dd5100705eb5f2ba5c5cc98b1
diff --git a/res/layout/video_preference.xml b/res/layout/video_preference.xml
index 5f7116d..fe7f26f 100644
--- a/res/layout/video_preference.xml
+++ b/res/layout/video_preference.xml
@@ -24,13 +24,15 @@
         android:layout_height="wrap_content"
         android:src="@drawable/accessibility_screen_magnification_background"
         android:scaleType="fitXY"
-        android:adjustViewBounds="true" />
+        android:adjustViewBounds="true"
+        android:importantForAccessibility="noHideDescendants" />
 
     <VideoView
         android:id="@+id/video"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignTop="@id/video_background"
-        android:layout_centerHorizontal="true" />
+        android:layout_centerHorizontal="true"
+        android:importantForAccessibility="noHideDescendants" />
 
 </RelativeLayout>
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