Change event isn't firing when the user reverts the value of a color/date/time input after JS changed the value

Setting the value through the value property wasn't setting the textAsOfLastFormControlChangeEvent.
So change events weren't firing when the user changes the value back to
the one that was set before JS changed it.

TEST=automated.
BUG=244065

Review URL: https://chromiumcodereview.appspot.com/23851005

git-svn-id: svn://svn.chromium.org/blink/trunk@157061 bbb929c8-8fbe-4397-9dbb-9b2b20218538