GitLab

Rather than removing the command decoder's reference to the current
surface before ContextGroup destruction, do so afterwards.  Group
destruction might need the surface.

Bug: 718117
Change-Id: I39edc795a427c89f9a31fbd9d9d5ad58f9de0000
Reviewed-on: https://chromium-review.googlesource.com/574636Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487155}