Implement harmful app warning at activity launch

Bug: 63909431
Test: manual

Change-Id: I8a5497421cb8130af8cdd5129b0f6e1707a01e36
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index b3d6357..0f43db0 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -134,6 +134,7 @@
     <!-- Permission needed to access privileged VR APIs -->
     <uses-permission android:name="android.permission.RESTRICTED_VR_ACCESS" />
     <uses-permission android:name="android.permission.MANAGE_BIND_INSTANT_SERVICE" />
+    <uses-permission android:name="android.permission.SET_HARMFUL_APP_WARNINGS" />
 
     <application android:label="@string/app_label"
                  android:defaultToDeviceProtectedStorage="true"