Add the press_key method back

This method was accidentially removed. Add it back.

BUG=chromium:423527
TEST=Ran a Chameleon test display_Resolution passed.

Change-Id: I89f07b01ca2d2b9283e3b2ed877c0febdd5b5999
Reviewed-on: https://chromium-review.googlesource.com/223513
Tested-by: Wai-Hong Tam <waihong@chromium.org>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
1 file changed