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Releasing SharedContextState needs a context current if it is GL.
So we need to make a gl context current for it.

Bug: 1157501
Change-Id: I7cdcff0422f83949065adcd386bb6d5f8c27a09b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2645332
Commit-Queue: Peng Huang <penghuang@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Auto-Submit: Peng Huang <penghuang@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846327}