Fix missing backspace key

When hardware keyboard is enabled, the backspace key is missing
and text cannot be delete. This commit handles this special case.

Change-Id: Ifad98797649d54fe566ba122abc2f8c63d8e2820
(cherry picked from commit 4aa2dc79ec8045e300bc3a945ea7f9e13f7c2536)
Merge "Fix missing backspace key" into studio-1.0-dev
Fix missing enter key

With hardware keyboard enabled, "enter" key is missing and there
is no way to enter multiple line text. This commit handles this
special case.

Change-Id: Id9d77d0c8b786a057f6b44f779a90cd85fa34832
Merge commit 'eeae4dd' into studio-1.1-dev
Merge "Fix missing enter key" into studio-1.0-dev
Merge "Fix missing enter key" into studio-1.0-dev
automerge: 49adefa

* commit '49adefa7b84982c310655448bebd1d50531da39b':
  Fix missing enter key
Merge commit \'eeae4dd\' into studio-1.1-dev
automerge: 29842cd

* commit '29842cd812c8d7ffd053eab19a895b819abebc70':
  Fix missing backspace key
Merge "Fix missing enter key" into studio-1.0-dev automerge: 49adefa
automerge: 57963bc

* commit '57963bc4f94dfbf32c3a18db96729d25ee06a8c7':
  Fix missing enter key