Merge 139419

Merge 139419
> Connect UserGestureIndicator for mousedown and mouseup events
> https://bugs.webkit.org/show_bug.cgi?id=105138
> 
> Reviewed by Adam Barth.
> 
> Source/WebCore:
> 
> Ports that consume user gestures to prevent certain types of pop-ups
> need to be able to connect mousedown and mouseup events, otherwise, a
> single mouse click will allow for opening multiple pop-ups.
> 
> Note that a mousedown is not always followed by a mouseup and vice
> versa, e.g. when the mousedown results in a context menu being shown, or
> something is dragged into the page.
> 
> Test: platform/chromium/fast/events/popup-allowed-from-gesture-only-once-two-events.html
> 
> * page/EventHandler.cpp:
> (WebCore::EventHandler::clear):
> (WebCore::EventHandler::handleMousePressEvent):
> (WebCore::EventHandler::handleMouseReleaseEvent):
> * page/EventHandler.h:
> 
> LayoutTests:
> 
> * platform/chromium/fast/events/popup-allowed-from-gesture-only-once-two-events-expected.txt: Added.
> * platform/chromium/fast/events/popup-allowed-from-gesture-only-once-two-events.html: Added.
> 

TBR=jochen@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=139843