[EFL][Qt][WebGl] Random crash in GraphicsContext3D::drawArrays

[EFL][Qt][WebGl] Random crash in GraphicsContext3D::drawArrays
https://bugs.webkit.org/show_bug.cgi?id=107178

Patch by Viatcheslav Ostapenko <sl.ostapenko@samsung.com> on 2013-01-21
Reviewed by Noam Rosenthal.

Workaround for the problem in mesa when internal llvm pipe object is deleted
later than the screen object. Screen object is deleted because the corresponding
X server display connection closed.
Keep X server display connection open until program shutdown.
OffScreenRootWindow::display is now static, so there is no need to create
OffScreenRootWindow object on client side.

Fixes crash that appears during run of fast/canavs/webgl tests.

* platform/graphics/surfaces/glx/GraphicsSurfaceGLX.cpp:
(OffScreenRootWindow):
(WebCore::OffScreenRootWindow::DisplayConnection::DisplayConnection):
(DisplayConnection):
(WebCore::OffScreenRootWindow::DisplayConnection::~DisplayConnection):
(WebCore::OffScreenRootWindow::DisplayConnection::display):
(WebCore::OffScreenRootWindow::display):
(WebCore::OffScreenRootWindow::~OffScreenRootWindow):
(WebCore):
(WebCore::GraphicsSurfacePrivate::GraphicsSurfacePrivate):
(WebCore::GraphicsSurfacePrivate::createSurface):
(WebCore::GraphicsSurfacePrivate::createPixmap):
(WebCore::GraphicsSurfacePrivate::makeCurrent):
(WebCore::GraphicsSurfacePrivate::doneCurrent):
(WebCore::GraphicsSurfacePrivate::swapBuffers):
(WebCore::GraphicsSurfacePrivate::display):
(WebCore::GraphicsSurfacePrivate::size):
(WebCore::GraphicsSurfacePrivate::findFBConfigWithAlpha):
(WebCore::GraphicsSurfacePrivate::clear):
(GraphicsSurfacePrivate):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@140342 268f45cc-cd09-0410-ab3c-d52691b4dbfc