Don't create multiple user gesture indicators when forwarding events to sub frames
https://bugs.webkit.org/show_bug.cgi?id=111923

Reviewed by Adam Barth.

Ports that implement consumable user gestures depend on a single user
gesture indicator being created in response to a single user gesture.

Source/WebCore:

Test: platform/chromium/fast/events/popup-allowed-from-gesture-only-once-iframes.html

* dom/UserGestureIndicator.cpp:
(WebCore::isDefinite):
(WebCore::UserGestureIndicator::UserGestureIndicator):
(WebCore::UserGestureIndicator::processingUserGesture):
* dom/UserGestureIndicator.h:
* page/EventHandler.cpp:
(WebCore::EventHandler::handleMousePressEvent):
(WebCore::EventHandler::handleMouseDoubleClickEvent):
(WebCore::EventHandler::handleMouseReleaseEvent):
(WebCore::EventHandler::keyEvent):
(WebCore::EventHandler::handleTouchEvent):

LayoutTests:

* platform/chromium/fast/events/popup-allowed-from-gesture-only-once-iframes-expected.txt: Added.
* platform/chromium/fast/events/popup-allowed-from-gesture-only-once-iframes.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145481 268f45cc-cd09-0410-ab3c-d52691b4dbfc