[Qt] Page doesn't get repainted while panning is in progress https://bugs.webkit...

[Qt] Page doesn't get repainted while panning is in progress https://bugs.webkit.org/show_bug.cgi?id=78602

Reviewed by Simon Hausmann.

The tiling code needed the current visibleContentsRect in order to be
able to create tiles, so we now make sure it gets it. We also needed
to make sure to set the trajectory vector while panning and while the
flicking engine was animating kinetic scrolling.

* UIProcess/API/qt/qquickwebview.cpp:
(QQuickWebViewFlickablePrivate::_q_updateVisibleContentRectAndScale):
(QQuickWebViewPrivate::_q_viewportTrajectoryVectorChanged):
* UIProcess/DrawingAreaProxy.h:
(WebKit::DrawingAreaProxy::setVisibleContentRectTrajectoryVector):
* UIProcess/DrawingAreaProxyImpl.cpp:
(WebKit::DrawingAreaProxyImpl::setVisibleContentRectTrajectoryVector):
* UIProcess/DrawingAreaProxyImpl.h:
(DrawingAreaProxyImpl):
* UIProcess/LayerTreeHostProxy.h:
(LayerTreeHostProxy):
* UIProcess/qt/LayerTreeHostProxyQt.cpp:
(WebKit::LayerTreeHostProxy::setVisibleContentRectTrajectoryVector):
* UIProcess/qt/QtViewportInteractionEngine.cpp:
(WebKit::QtViewportInteractionEngine::QtViewportInteractionEngine):
(WebKit::QtViewportInteractionEngine::flickableMovingStateChanged):
(WebKit):
(WebKit::QtViewportInteractionEngine::panMoveStarted):
(WebKit::QtViewportInteractionEngine::panMoveEnded):
(WebKit::QtViewportInteractionEngine::flickableMovingPositionUpdate):
(WebKit::QtViewportInteractionEngine::panGestureRequestUpdate):
* UIProcess/qt/QtViewportInteractionEngine.h:
(QtViewportInteractionEngine):
* WebProcess/WebPage/LayerTreeHost.h:
(WebKit::LayerTreeHost::setVisibleContentRectTrajectoryVector):
* WebProcess/WebPage/LayerTreeHost.messages.in:
* WebProcess/WebPage/qt/LayerTreeHostQt.cpp:
(WebKit::LayerTreeHostQt::setVisibleContentRectAndScale):
(WebKit::LayerTreeHostQt::setVisibleContentRectTrajectoryVector):
* WebProcess/WebPage/qt/LayerTreeHostQt.h:
(LayerTreeHostQt):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108625 268f45cc-cd09-0410-ab3c-d52691b4dbfc