<rdar://problem/7694674> Hover states not updated when overflow section scrolls under stationary mouse pointer
https://bugs.webkit.org/show_bug.cgi?id=35949

Reviewed by Darin Adler.

WebCore: 

Test: fast/events/overflow-scroll-fake-mouse-move.html

Soon after an overflow section scrolls under the mouse pointer, dispatch
a fake mouse move event. This is similar to how frame scrolling is handled
in WebKit, and has the effect of updating hover state, dispatching DOM mouse
events, and updating the tool tip.

* page/EventHandler.cpp:
(WebCore::EventHandler::EventHandler): Initialize m_fakeMouseMoveEventTimer.
(WebCore::EventHandler::~EventHandler): Assert that the timer is not active.
(WebCore::EventHandler::clear): Stop the timer.
(WebCore::EventHandler::handleMousePressEvent): Cancel pending fake mouse
move events.
(WebCore::EventHandler::handleMouseMoveEvent): Ditto.
(WebCore::EventHandler::dispatchFakeMouseMoveEventSoonInQuad): If the mouse
is in the passed-in quad, ensure that a fake mouse move event is scheduled
to fire soon.
(WebCore::EventHandler::cancelFakeMouseMoveEvent): Does what the name says.
(WebCore::EventHandler::fakeMouseMoveEventTimerFired): Constructs a
PlatformMouseEvent with the current mouse location, modifier key state and
time stamp and calls mouseMoved().
* page/EventHandler.h:
* platform/PlatformKeyboardEvent.h: Declared getCurrentModifierState().
* platform/android/KeyEventAndroid.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Stubbed out.
* platform/brew/PlatformKeyboardEventBrew.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Ditto.
* platform/chromium/PlatformKeyboardEventChromium.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Added.
* platform/efl/PlatformKeyboardEventEfl.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Stubbed out.
* platform/gtk/KeyEventGtk.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Ditto.
* platform/haiku/PlatformKeyboardEventHaiku.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Added.
* platform/mac/KeyEventMac.mm:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Ditto.
* platform/qt/PlatformKeyboardEventQt.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Stubbed out.
* platform/win/KeyEventWin.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Added.
* platform/wx/KeyboardEventWx.cpp:
(WebCore::PlatformKeyboardEvent::getCurrentModifierState): Ditto.
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::scrollToOffset): Call
EventHandler::dispatchFakeMouseMoveEventSoonInQuad(). Moved things around
a little to avoid computing the repaint rect twice.

LayoutTests: 

* fast/events/overflow-scroll-fake-mouse-move-expected.txt: Added.
* fast/events/overflow-scroll-fake-mouse-move.html: Added.
* fast/events/touch/basic-multi-touch-events.html:
* fast/events/touch/basic-single-touch-events.html:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55909 268f45cc-cd09-0410-ab3c-d52691b4dbfc