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Enabling SkiaRenderer on Chrome OS currently fails a DCHECK [1] that
asserts the backing GLSurface has a top-left origin. Since
GetOrigin() returns the OS presentation API's origin, GbmSurfaceless
should also return a top-left origin. For example, if you call
gbm_bo_map with (x = 0, y = 0), the returned data pointer will
correspond to the top-left of the buffer.

[1] https://source.chromium.org/chromium/chromium/src/+/master:components/viz/service/display_embedder/output_presenter_gl.cc;l=223;drc=238120617b24d1856e0d66e2a6d3272a5e94f658

Change-Id: I0cdfa9d3414cb844dc33470c6342a3a944074d09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511879Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Brian Ho <hob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824399}