[EFL][WK2][WebGL] The top left side of the screen is shown inside the canvas element
https://bugs.webkit.org/show_bug.cgi?id=105136

Patch by Viatcheslav Ostapenko <sl.ostapenko@samsung.com> on 2013-01-07
Reviewed by Noam Rosenthal.

Use glXSwapBuffers to force resize of GL surface after X window resize.

Fixes fast/canvas/webgl/webgl-composite-modes.html pixel test on EFL platform.

* platform/graphics/surfaces/glx/X11WindowResources.cpp:
(WebCore::X11OffScreenWindow::reSizeWindow):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139033 268f45cc-cd09-0410-ab3c-d52691b4dbfc