Improve MakeWebKeyboardEventFromAuraEvent() so a web page could receive a DOM3 spec compliant keyboard event.

BUG=127142
TEST=ran content_unittests + manual

Review URL: https://chromiumcodereview.appspot.com/10541139

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@142209 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed