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Add tests for toggling flags and the persistent notification. Also
remove test batching for flags fragment tests to so the flags service
is killed when the process is killed leaving a clean state.

Fixed: 1130599
Test: run_webview_instrumentation_test_apk -f "*FlagsFragmentTest*"
Change-Id: I0cb416471d3b79e98ed9ef8ad5e760b4bfaa1083
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438534
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814362}