We weren't checking the return status of an XGetWindowAttributes() call
while checking for a resized window. It appears that it can start to
fail possibly due to an out-of-memory situation or the window being
destroyed before the EGL surface.

Note that the EGL spec does not have a recommendation on how to handle
this situation. Generating EGL_BAD_ALLOC is intended for eglCreate*
call failures, while EGL_BAD_NATIVE_WINDOW appears to be reserved for
calls that take a native window as a parameter. eglSwapBuffers is
neither.

Bug chromium:819481

Change-Id: I270730567b5179ee43b814e8bd017b601dfbe079
Reviewed-on: https://swiftshader-review.googlesource.com/17708Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>