Add Oilpan transition types for core/speech.

Add Oilpan support to the SpeechInputResult interface object along
with its list version.

R=
BUG=340522

Review URL: https://codereview.chromium.org/170423004

git-svn-id: svn://svn.chromium.org/blink/trunk@167687 bbb929c8-8fbe-4397-9dbb-9b2b20218538