Cherry pick: Show IME when DPAD_CENTER is pressed

BUG: 12117192

Upstream bug description:
BUG=343311
Review URL: https://codereview.chromium.org/161933002
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251447

Change-Id: Iab6ac09b25b5b5c20cada7dd05047b2e4c44f084
2 files changed