Prevent arrow keys from leaving editable TextViews

Bug: 24342334
Bug: 31662248
Test: Tested in a test-app and verified that arrow presses/holding
      do not send focus out of an EditText. Relevant TextViewTest
      and EditTextTest s still pass

Change-Id: I288d9397d61844b8b650ed54cfbb6769226074b8
(cherry picked from commit I6abfe75352f09a49ea473fb0e2dec84c6c5270c4)