Expose ContactSelectionActivity to Instant Apps

This is needed for Instant Apps to be able to use the Contacts Picker

Bug: 34468723
Test: cts-tradefed run commandAndExit cts-dev -m
CtsAppSecurityHostTestCases -t android.appsecurity.cts.EphemeralTest
Test: Manually verified that ACTION_PICK works from an Instant App

Change-Id: Id091fd0172d450078807f5e78518027a77896898
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0b24489..8461a27 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -183,7 +183,8 @@
             android:launchMode="singleTop"
             android:theme="@style/ContactPickerTheme"
             android:uiOptions="splitActionBarWhenNarrow"
-            android:windowSoftInputMode="adjustResize">
+            android:windowSoftInputMode="adjustResize"
+            android:visibleToInstantApps="true">
             <intent-filter>
                 <action android:name="android.intent.action.INSERT_OR_EDIT"/>
                 <category android:name="android.intent.category.DEFAULT"/>