MediaRouter: Prevent activity from restarting

This keeps the playlist for orientation changes.

Bug: 23399327
Change-Id: I89d436a0455190798180ceef3bcb2028eacbf23b
diff --git a/samples/Support7Demos/AndroidManifest.xml b/samples/Support7Demos/AndroidManifest.xml
index 288b124..164411a 100644
--- a/samples/Support7Demos/AndroidManifest.xml
+++ b/samples/Support7Demos/AndroidManifest.xml
@@ -60,6 +60,7 @@
         <!-- MediaRouter Support Samples -->
 
         <activity android:name=".media.SampleMediaRouterActivity"
+                android:configChanges="orientation|screenSize"
                 android:label="@string/sample_media_router_activity_dark"
                 android:theme="@style/Theme.AppCompat">
             <intent-filter>
@@ -69,6 +70,7 @@
         </activity>
 
         <activity android:name=".media.SampleMediaRouterActivity$Light"
+                android:configChanges="orientation|screenSize"
                 android:label="@string/sample_media_router_activity_light"
                 android:theme="@style/Theme.AppCompat.Light">
             <intent-filter>
@@ -78,6 +80,7 @@
         </activity>
 
         <activity android:name=".media.SampleMediaRouterActivity$LightWithDarkActionBar"
+                android:configChanges="orientation|screenSize"
                 android:label="@string/sample_media_router_activity_light_with_dark_action_bar"
                 android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
             <intent-filter>