ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

ui/ozone/platform/drm/gpu/gbm_surface_factory.cc

Index: ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc b/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
index 70433818f07f2fbc6b62e3b135a7caefd7ef6081..bb3aff7bba610640781eb940a507a1aac75a5f37 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
@@ -150,20 +150,6 @@ bool GbmSurfaceFactory::CanShowPrimaryPlaneAsOverlay() {
   return allow_surfaceless_;
 }
 
-bool GbmSurfaceFactory::CanCreateNativePixmap(BufferUsage usage) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  switch (usage) {
-    case MAP:
-      return false;
-    case PERSISTENT_MAP:
-      return false;
-    case SCANOUT:
-      return true;
-  }
-  NOTREACHED();
-  return false;
-}
-
 scoped_refptr<GbmDevice> GbmSurfaceFactory::GetGbmDevice(
     gfx::AcceleratedWidget widget) {
   return static_cast<GbmDevice*>(