Adds widget namespace.

Test: m -j.
Bug: 145528298
Change-Id: I6703f20dd1c13fb2eae5a930aae5835247c7a297
diff --git a/core/java/android/provider/DeviceConfig.java b/core/java/android/provider/DeviceConfig.java
index abf34ca..9dc6806 100644
--- a/core/java/android/provider/DeviceConfig.java
+++ b/core/java/android/provider/DeviceConfig.java
@@ -357,6 +357,13 @@
     @TestApi
     public static final String NAMESPACE_PERMISSIONS = "permissions";
 
+    /**
+     * Namespace for all widget related features.
+     *
+     * @hide
+     */
+    public static final String NAMESPACE_WIDGET = "widget";
+
     private static final Object sLock = new Object();
     @GuardedBy("sLock")
     private static ArrayMap<OnPropertiesChangedListener, Pair<String, Executor>> sListeners =