GitLab

Introduce a viz::DisplayResourceProvider::ScopedOverlayLockGL structure,
which mirrors the ScopedReadLockGL, except it specifies a mode of
GL_SHARED_IMAGE_ACCESS_MODE_OVERLAY_CHROMIUM instead of the usual
GL_SHARED_IMAGE_ACCESS_MODE_READ_CHROMIUM.

This is ignored (and treated the same as READ) by all implementations,
but the next patch will use OVERLAY in a way that would break if READ
were specified.

Bug: 1092155
Change-Id: I4e23d6514b67b1f9960a08d206cde0765928ae2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255880Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781427}