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Under lost device conditions, eglMakeCurrent can fail, even when releasing
the context. As we otherwise assume that we have correct bindings when
GLContext::IsCurrent returns true, we need to track the lost state to
ensure that after ReleaseCurrent, IsCurrent will return false.

Bug: 928693
Change-Id: I5bbf2616f872532c03da1e1beeade5c94d920b92
Reviewed-on: https://chromium-review.googlesource.com/c/1457675Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Auto-Submit: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629879}