Revert "Remove searchable metadata."

We are not deprecating the global search API in this release, so we
should keep this for now.

Bug: 10487397
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e954390..bae0341 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -141,6 +141,9 @@
                 <data android:mimeType="vnd.android.cursor.dir/contact" />
             </intent-filter>
 
+            <meta-data android:name="android.app.searchable"
+                android:resource="@xml/searchable"
+            />
         </activity>
 
         <activity android:name=".activities.ContactSelectionActivity"