Visit Uris added by WearableExtender

This CL also fixes the reflection-based test, which was supplying a List containing junk Objects to methods that expected generics such as List<Something>.

Bug: 283962802
Test: atest + manual (POC app now crashes on notify() as expected)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:68b20a008ebfca2aba6f0f9ec74ba35c2bbbb7ed)
Merged-In: I0da18c631eb5e4844a48760c7aaedab715a0bfed
Change-Id: I0da18c631eb5e4844a48760c7aaedab715a0bfed