Shadow DOM: Move handleDOMActivateEvent back from InputTypeView to InputType.

Shadow DOM: Move handleDOMActivateEvent back from InputTypeView to InputType.

This affects input[type=color], input[type=file], input[type=image],
input[type=reset], and input[type=submit]. Without this change, web authors have
no ways to open a file chooser dialog.

We exclude BaseChooserOnlyDateAndTimeInputType::handleDOMActivateEvent,
Date/time input types on Android, because of consistency with non-Android ports,
which don't respond to DOMActivate.

Also, this CL makes it possible to test if a file chooser is opened.

BUG=274205
TEST=automated.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=157648

[keishi, 2013-09-12 01:23:18]

lgtm

[commit-bot: I haz the power, 2013-09-12 01:25:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tkent@chromium.org/23484032/10001

[commit-bot: I haz the power, 2013-09-12 01:31:04]

Change committed as 157648