Added scrolling to focusSearchWithOtherFocusables test

When requestFocus on an out-of-bound view was called, that view stayed
off-screen because scroll methods were not implemented in
this test layout manager. Added offsetting of the views both vertically and
horizontally.

Test: ./gradlew support-recyclerview-v7:connectedCheck
-Pandroid.testInstrumentationRunnerArguments.class=android.support.v7.widget.RecyclerViewLayoutTest#focusSearchWithOtherFocusables

Change-Id: I12393de6c685b338f0d17b0f36d5e1da4c2d043d
1 file changed