Fix destruction order. Defer destroying the GL context until the destructor so that other GL resources can be destroyed first. This fixes crashes on some linux GPU drivers.
Fix destruction order. Defer destroying the GL context until the
destructor so that other GL resources can be destroyed first. This
fixes crashes on some linux GPU drivers.

mrobinson/skia,mrobinson/skia,mrobinson/skia,mrobinson/skia,mrobinson/skia