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Michael Spang authoredUse the concrete type of the dumb buffer for cursors. We don't need polymorphism here, and since cursors don't have framebuffers, this is needed before evolving ScanoutBuffer into a concrete framebuffer type. Bug: 869206 Change-Id: I5ee8162cd103d55df320cbc8e35be29e9ac15562 Reviewed-on: https://chromium-review.googlesource.com/1155911 Commit-Queue: Michael Spang <spang@chromium.org> Reviewed-by: Daniel Nicoara <dnicoara@chromium.org> Cr-Commit-Position: refs/heads/master@{#579535} 47cdc66b