Add search to app info list.

- add a search option menu to the manage applications page.
- add a search filter to the app list adapter to remove any app whose
app name does not contain the search query.

Change-Id: Ie749daeef2cdc4a22fade45422ae90f44d00ceb2
Fixes: 119598311
Test: make RunSettingsRoboTests

res/menu/manage_apps.xml

@@ -15,6 +15,13 @@
 -->
 
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/search_app_list_menu"
+        android:title="@string/search_settings"
+        android:icon="@drawable/ic_find_in_page_24px"
+        android:showAsAction="always|collapseActionView"
+        android:actionViewClass="android.widget.SearchView" />
+
     <item
         android:id="@+id/advanced"
         android:title="@string/advanced_apps"