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With this CL, SkiaRenderer will receive a signal from
GpuServiceImpl::LoseAllContexts and mark the shared context_state_ as
lost. This will cause us to abandon all future draws and no-op the
releases.

Unfortunately, we cannot delete fulfilled promise images after
GrContext::abandonContext is called. So an explicit leak in
ImageContextImpl::OnContextLost was added.

TBR=boliu@chromium.org

Bug: 1011420
Change-Id: I5f5e178b6a51d770534c2260274f0b9c75c21831
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864413
Commit-Queue: Jonathan Backer <backer@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706922}