Remove context pointer from State BUG=angle:685 State needs only to track a few variables from Context's caps, so store those instead of a pointer to Context. Change-Id: I36d448dcaccf9780d6df2cfc82ef975b2ba0346f Reviewed-on: https://chromium-review.googlesource.com/219804 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Shannon Woods <shannonwoods@chromium.org>