ozone: Support key repeat

For key repeat events, input.value == 2. This should be treated as a
keypress rather than release so that autorepeat works.

Review URL: https://codereview.chromium.org/26895002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228049 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228049