Occlusion(const gfx::Transform& draw_transform,
const SimpleEnclosedRegion& occlusion_from_outside_target,
const SimpleEnclosedRegion& occlusion_from_inside_target);
Occlusion(const gfx::Transform& draw_transform,
const SimpleEnclosedRegion& occlusion_from_outside_target,
const SimpleEnclosedRegion& occlusion_from_inside_target);