Managing the context was dropped. Adding back in.

This was accidently removed in cl/149048

BUG=chromium:877611

Change-Id: I9608b45848c27fc79e0f26e40bb9a1c4deb50f5b
Reviewed-on: https://skia-review.googlesource.com/150148
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Khusal Sagar <khushalsagar@chromium.org>
2 files changed