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We already have the GrDirectContext available, so just use that.

Change-Id: I49436e7a8fefc0cc3bdd9e6425bd730c4a897e03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410539
Auto-Submit: Adlai Holler <adlai@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Adlai Holler <adlai@google.com>
Cr-Commit-Position: refs/heads/master@{#807415}